In real chess, we play "touch move." If you touch a piece, you have to move it. There is no "take back." If you are advocating that people should be able to take back their blunders, I don't think any decent chess player would agree with you.
But then again, most ppl playing on chess.com aren't decent chess players, nor do they have any serious ambition to turn into one.
Whenever I play with my dad or friends OTB, I allow takebacks.
If I play on chess.com, I would just expect a lack of reciprocicity.
A takeback button would be absolutely abused. It's completely out of the question as far as I'm concerned. On related note, one of the reasons I hate playing on lichess is because everyone wants a takeback. One player was given several takebacks from me after blundering but then wouldn't give me one when I genuinely mouse slipped. After that, I ignore all takeback requests unless I think it was a slip, nor do I ask for them myself.