But here's the issue, SE can't win either way... they tried mechanic based stuff before (see Step's of Faith), and clearly far too many people aren't good enough to get past even easy mechanics because they don't want to put in any effort, therefore it gets nerfed to the ground and becomes useless or the good players carry other people through it and the cycle repeats later.
Now on the other hand, the only other real way of challenging players currently is DPS checks. Tight ones that force the entire party to actively push DPS to get past it until the content is over geared. And we all know how that turns out...
See what he common cause is? People who don't want to put in effort to learning or doing content joining and letting the rest of the able party down because they lack the skill to play the game to acceptable levels that both the game and players require.
This is what parser's are made to help with, it's the people that are the issue, NOT the tool.
I swear it's like people want the entire game to be faceroll content you can get past by spamming a single skill... honestly we need more "toxicity" to to encourage players to get better, otherwise nothing will change, and a parser is one step towards that.
The fault is not entirely on the dev's they have clearly tried mechanic based content before, but the majority of the player base has shown they can't handle anything other than spamming buttons mindlessly, therefore the only other current alternative is a DPS check.