Maybe you're right, but can you argue that they would be a very useful tool for many to improve? I mean, at its most basic, you have players who perform well and know how/why they perform well, players who don't and don't know how/why, and players who simply don't care. . . 2 of those categories would remain largely unaffected by parser implementation. But those stuck in that very grey area in the middle - not knowing how or why they don't do well - would benefit GREATLY.

Thing is, you can give anyone all the tools necessary to improve, and if they don't, it's purely on them alone. However the popular argument is that parsers are merely a shaming tool, and this is just not accurate. That would be like claiming fault with taking piano lessons when I can play by ear but can't read music. The larger majority of the playerbase can play by ear or merely repeat what they've seen/done, but it's only when you begin to not only see but understand just what you're doing and how well you're doing it do you truly improve.

So the idea that parsers aren't needed outside raids essentially supports the skill divide/gap between players (this in itself often leading to the old casual/elite nonsense). Not everyone is going to become Elton John, but we can all learn to play the piano better, even outside of raids.