Of course not. You can just use a calculator and a spreadsheet. However, I'd prefer to spend those few hours once in a while actually playing the game than doing the math.
Anyone that is a "top" at their class either used parser, did the calculations the old-fashioned way (the two probably combine to 99% of the best 1 000 players), or have an immensely good luck/instinct that borders on an innate genius. Sure, there are people like that...but most are average. Cause...ya know...that's what "average" means.
Of course. But those who wanna learn will have a lot easier time at learning with a parser.
...I'm asking for a developer-made parser...so yeah...Developers aren't exactly users...
Parsers may have been suggested 40 times. This suggestion is about a method they could be implemented, not parsers per see.
Also, read. It doesn't hurt, it's not difficult either. You cannot be kicked for not turning your numbers with my suggestion, because you can't turn them on. And neither can the person that asks you to turn them on or anyone else in the party. Once it would be set, it's in stone for the entire run. And if someone feels like entering a dungeon while being one of the people locking parsers out only to complain about there being no parsers and voting abandon for no parsers being accessible...well, that person would have way bigger problems than not seeing numbers...
So does actually reading fully first, instead of just skimming the title and progressing to make your post without caring about anything else written.
As for the people that extremely fear the numbers grieving...I had a peculiar run yesterday as a tank. Using just the combat log that is already in game, I found out that the damage dealers deal with their skills about 30% less damage than I do with the basic Fast Blade, as a paladin with a shield stance on. It took me a while to understand which damage is which (except my own) due to how messed up the combat log is in this game...but that alone would make it suitable for me to vote kick the two DPS if I was into that stuff (I'm not, there's no point, so long as we progress).
This however does not take into consideration a myriad of things (attack speed is one of them). In fact, this is the purest form of "basic numbers". And it is far more unfair.