Mistwell
Crusty Old Meatwad
A lot of people, myself and @Vaalingrade included, have had actively harmful experiences with alignment.
OK, so don't use it. There are subclasses in the game which some people also say harm their games...so they simply don't use them!
Because it's simple to ignore a CG next to a monster's entry in an adventure, but it take a lot more effort to go through the adventure and put it back in if you want it! And that is the bulk of where I use alignment. Not for PCs, not even for monsters in the monster manual (though I do use it there sometimes as well) but for entries in a published adventure. PARTICULARLY for the random monsters in published adventures. You suffer no harm from sticking two characters in that stat block, but I have to work a lot harder to put it all back for my uses. Which is why it feels like a personal dig that you cannot handle two characters next to a stat block which you know so many of your peers get value out of even if you don't.Whenever we bring them up, we are subjected to special pleading: no, that doesn’t count, the DM was using alignment wrong; no, that doesn’t count, that was a player or DM being a jerk and those exist everywhere.
So, it is not a personal dig against you, and just as you are saying “why do you want to remove something that my group finds useful”, others are saying “why do you want to keep something that has actively hurt our games?”.