That was exactly what i suggested some time ago, so i agree, i basically suggested most consulate bonus can scale, cause i always feel they are way too short, for example, a +7% to the atk or hp in late game is something like actually a +3% so it´s almos nothing, so one option was to make it like an aura just in the way it is calculated, so it´ll be x1.07 instead of +0.07 or let it scale, wich i think would be a little more complicated but could be better, like +(3-6-9-12-15)% etc.
But also with the wonders, just like porcelain tower, chinese iirc is the only one that has an scaling wonder, and that seems nice, just one is enough.
Completely agree, i always say this, people don´t realize that or don´t want to notice, all the other buffs to stats of the units of other civs like european, are forever (upgrades, techs, cards) and they have more upgrades, techs and cards than japanese at least, that´s why they compensate with auras, but euro civs can´t lose their stats, while japan you destroy a wonder in a raid and it´s gone forever, and with only the shogunate they have several things.
Even with all their wonders and auras japanese are not OP, you destroy that and japanese are just bad and mediocre, while other civs can be good 100% of the time, or even OP 100% of the time… anyway.