Guys hi, i have several questions about bet sizing strategies.
I am a bit confused with the following: as far as i get, according to "Mathematics of poker" the optimal bet size strategy would be to bet the same amount relative to the current pot size on each street, shoving on the river.
But in practise i see a lot of players betting smth like [ 1/3 ; 2/3 ; pot ] pattern in 3bet pots. Can anyone explain why that is better than f.e. bet 2/3 every street (in this example it's a case of 5.5 SPR that is common in 100 bb 3bet pots in cash games ) ?

Also, theory suggests that the bigger bet size we choose the more we can add bluffs in our range, that is esp. important on flop because that allows us to have the widest range possible (that shrinks on later streets).... So, why do we want to bluff smaller on dry boards when we have initiative and range and equity advantage, for example A22 flop our CO vs bb ? I mean nearly everyone is betting about 25-40% nowadays when it seems that we should bet bigger and bigger size will allow us to bet more bluff combos in our range

Those thoughts seem to be the contrary to how everyone plays and i can't find what flaws are in my logic