It’s ridiculous how AoE2 players act like the illogical and convoluted system they are used to is somehow objectively understandable.
But AoE3 does have its flaws. Shock infantry is not very intuitive or visually identifiable from some heavy infantry. Pirates are a completely different unit class from Barbary Corsairs despite being essentially interchangeable when it comes to movement, stance, weaponry, and theme. And it was a lot worse back in the day when they used the name “light infantry” for these units and the Aztec units were a lot less distinct looking.
Some of the new unit classes are also not at all intuitive. There’s zero visual difference between skirmishers and counter-skirmishers which is problematic. In my opinion they should have linked the dismounting units to the counter-skirmishers to visually reinforce the role. Then you could have the mounted version as heavy cavalry (a counter to skirms) and the dismounted version also a counter-skirmisher just in a different way. The horribly named and unintuitive Mounted Rifleman could be reworked into a Chasseur which had a historical role exactly like this.