Firstly Katakuri's power mochi had no issue dealing with g4 boundman unlike Doffy
Doffy's awakening did nothing to Luffy and the only reason Luffy didn't finish Doffy off in the first gear 4 usage was because he ran out of haki
The biscuit soldiers are apart of Crackers powers and the only reason that got dealt with was because of Nami and Luffy was able to cheese him. Gear fourth on it's own in that fight wouldn't be able to win
Also in terms of portrayal Cracker was shown being able to damage gear fourth Luffy while Doffy couldn't
Lastly beginning of the arc Luffy in gearth fourth was one shotted by base Kaido
Rooftop base Luffy is able to handle it perfectly fine
Law was able to tank an attack from Hybrid Kaido
This isn't even the same arc where One piece has had major power creep, water 7 and enies lobby is the best example of it