Just because roger was able to conqueror the seas with just his haki doesn't mean everyone else could too
Reasons being
But your faves just aint that guy pal
Reasons being
- The most obvious. No one has since his death
- The very strongest since his death have been devil fruit users with amazing haki. With the next ones coincidentally also having fruits with luffy and/or teach
- The closest thing we have to a current day roger is likely shanks but im pretty sure most people dont think he's the strongest
- Luffy, kaido, and likely newgate are examples of being a really strong devil fruit user and having amazing haki arent separate exclusive things
- We've seen characters with better haki lose to characters with worse or even no haki. Aka lufft vs the boa sister or franky and robin vs tobiroppo. Even if you don't want to count those im pretty sure most can agree the "weak trio" or at the very least mid trio isn't weaker than big mom pirates fodder πΏ
But your faves just aint that guy pal