you can be as condescending as you want but fact is only a few fighters in the entire series have the advanced forms of haki and it was NEVER stated that unlocking it in the heat of the battle is the only way to attain it. sabo used the top-tier internal destruction haki and you conveniently dodged that line of argument.
keep convincing yourself about your own headcanons about katakuri fighting all of the top tiers and still staying undefeated.
Revos have been underwhelming.......sabo got his fruit recently and 3-4 years ago I doubt he was YC level........yonko for most part have 20+ years to work with with shanks being an exception and have much bigger crews and more powerful characters so it makes sense.....revos are more like CP0 and yonko more like marines......
Revo bounties make sense to a certain extent, or at least are consistent, at the same time it underlines how special, Luffy, Ace and straw hats were.
Revos are only around for 6-8 years, yonkou commanders have careers spanning two decades.