Would you like an in-game parser?

[Voltyblast]

Again, what parsers offer is a precise number, you don't need a precise number to progress, you need skill.
Back in 2.0, where required ilvl wasn't even a thing, some people wouldn't invite you to Titan unless you already have a relic because heart phase was a DPS check. I did Titan with a team barely equipped from Amdapor Keep.
If you had me in your team as a DRG, with another DRG and his Gae Bolg, he could easily beat me on DPS even if his rotation was worse than mine.

As for 8 tank fights...yes, it would be fun...and doable for some trials. After all, a certain someone here did take part in a 7 PLD 1 SCH Seph EX

Then we live in two different worlds: I never managed to find groups that didn't ask for the highest dps possible, forcing them to have a parser. I was a tank and even I had to up my dps in order to do t13 (which they didn't even finish in the end and to this day I still haven't). Not that I care anymore: I'm done with raiding entirely, but as a tank I saw my static constantly replacing dps because they weren't high enough. I had no idea how low they were but I just assumed "not the best".

Server you go, mentality you get I suppose