If its savage, EX, ultimate or other content where a player can mess up real hard for everyone involved (causing wipes due to things like DPS checks, or failing mechanics, etc). Yeah, maknig a call out then mid fight isnt inherently unwarranted.

But if were talking about Dungeons, 24 mans on farm, basic and hard modes, etc. Things where a person could quite literally spam one DPS skill and probably still make the dps check, yeah, there is no reason why you shouldnt ask. Cause the general truth is simple: If youre doing Savage/EX/etc, thats high end content (more or less. People can debate that), and those involved should be aware of not only how to play their class but also fight mechanics. If they choose not to learn their class, thats on them. It matters then.

But in lower level stuff, no, being rude and shoving 'tips' into peoples face isnt warranted. It doesnt take you much effort to be like "Hey, would like some tips on how to play 'x'. I main that" or something. They can say no, and it sucks for you, cause MAYBE the run will go a touch slower, but its not hte end of hte world. Its a bit of push and pull. Standard content everyone goes through, youre going to have to put up with lower skilled people who may not want to get better. Save your advise for people who want it, or for content where it matters.