Is there a limit to what the haki barriers can stop? Do they automatically nullify anything that is coming towards them?
Note that they are not permanent and last relatively short but during that time frame they seem to be stopping everything.
They are an inferior version of Bari Bari no Mi which is basically a plot device that can stop anything it needs to.
Bartolomeo's fruit can probably stop even Robin from growing limbs on him while he is inside the barrier. That's how good it probably is.
While Bartolomeo's barrier is permanent and unbreakable, haki barriers are not permanent and eventually get broken or disipate if the incoming force is continuous.
So far, we have Luffy's barrier nullifying all the physical force Kaido is capable of in his hybrid on top of the force produced by swinging the club.
This is unclear but Zoro probably used a barrier to stop Hakai as well which is a more logical explanation than anything else.
Barrier's properties of stopping everything and anything explains better how Zoro could have stopped an island buster from 2 Yonkos combined.
Now, since Hakai was a continuous attack, the barrier eventually dissipated and Hakai flew off the island.
We also have the Gura shockwave being stopped by the barrier of the 3 Admirals together.
The only instance of a barrier not stopping the incoming force is when Luffy pushed back one of the Boa Sisters.
Not sure if that is something that needs to be considered or it's just an anomaly like many other things coming in contact with Luffy...
Haki barriers work similar to dials, while using different principles, the outcome they achieve is nearly identical.
While you need a different type of dial to nullify(absorb) different attacks(physical force, flames, iron, gas...), haki barriers are universal.
Luffy putting up a barrier in front of Kaido's club is identical to the impact dial facing Sanji's hammer. Both have nullified the incoming force.
That's the defensive use. Even the offensive use is identical, both empower the attacks. Impact dial hit hits the insides just like haki barrier does...
Now, onto the interesting part - what can pierce haki barriers if Kaido's force and energy blast from 2 Yonkos cant?
Kizaru's lasers? Kuma's paw shockwaves? Bullets? Flying sword slash? Direct sword slash? Barrier-clad punch? Perona's ghosts? Borobreath? Demolition breath? Masser Cannon? Lightning attacks? Aokiji's ice? Akainu's magma? Sengoku's shockwaves? Gura Gura no Mi's vibrations? Magellan's poison? What about beams from Foxy?
Is any of these able to pass through the haki barriers? If not, where is the OP combat heading towards? The endless blocking festival?
What are your thoughts on it?
Note that they are not permanent and last relatively short but during that time frame they seem to be stopping everything.
They are an inferior version of Bari Bari no Mi which is basically a plot device that can stop anything it needs to.

Bartolomeo's fruit can probably stop even Robin from growing limbs on him while he is inside the barrier. That's how good it probably is.

While Bartolomeo's barrier is permanent and unbreakable, haki barriers are not permanent and eventually get broken or disipate if the incoming force is continuous.
So far, we have Luffy's barrier nullifying all the physical force Kaido is capable of in his hybrid on top of the force produced by swinging the club.
This is unclear but Zoro probably used a barrier to stop Hakai as well which is a more logical explanation than anything else.
Barrier's properties of stopping everything and anything explains better how Zoro could have stopped an island buster from 2 Yonkos combined.
Now, since Hakai was a continuous attack, the barrier eventually dissipated and Hakai flew off the island.
We also have the Gura shockwave being stopped by the barrier of the 3 Admirals together.
The only instance of a barrier not stopping the incoming force is when Luffy pushed back one of the Boa Sisters.
Not sure if that is something that needs to be considered or it's just an anomaly like many other things coming in contact with Luffy...
Haki barriers work similar to dials, while using different principles, the outcome they achieve is nearly identical.
While you need a different type of dial to nullify(absorb) different attacks(physical force, flames, iron, gas...), haki barriers are universal.
Luffy putting up a barrier in front of Kaido's club is identical to the impact dial facing Sanji's hammer. Both have nullified the incoming force.
That's the defensive use. Even the offensive use is identical, both empower the attacks. Impact dial hit hits the insides just like haki barrier does...
Now, onto the interesting part - what can pierce haki barriers if Kaido's force and energy blast from 2 Yonkos cant?
Kizaru's lasers? Kuma's paw shockwaves? Bullets? Flying sword slash? Direct sword slash? Barrier-clad punch? Perona's ghosts? Borobreath? Demolition breath? Masser Cannon? Lightning attacks? Aokiji's ice? Akainu's magma? Sengoku's shockwaves? Gura Gura no Mi's vibrations? Magellan's poison? What about beams from Foxy?
Is any of these able to pass through the haki barriers? If not, where is the OP combat heading towards? The endless blocking festival?
What are your thoughts on it?

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