Of course 10bit is much worse. One sample has only 1024 different levels it can be at while 16bit has 65536. But once you go to higher bit-depths that number is going to increase for sure but there comes a moment when the differences are unhearable.
All this tells me is that you didn’t try what I said to try.
Honestly, the proof is in the pudding.
Regarding this pic. the problem is that not every one can afford the big $ headphones as well