What even is the difference between a tv and a monitor other than size?

Sound, remote, additional "optimization" like adaptive contrast, (non-accurate, vivid) colors etc., more outputs like optical audio,....

away with those "optimizations" :)

Agreed. These usually come up when people use the LG oled TVs with pcs and get annoyingly reminded that they are not actual monitors. In particular it can be very difficult to turn these "optimizations" off.