Stop the WoWificaton (ui mods)

[Absurdity]

TBH I'm pretty sure WoW doesn't require mods either. However over usage of them on that game has probably caused the skill level of the player base there to degrade to the point they can no longer play the game without them.

Actually the opposite. Most players in WoW were using boss mods to the point that the devs increased the difficulty with those boss mods in mind, so now it is basically impossible to do a high end raid encounter without those boss mods, since the base assumption for encounter design is that you're using one.

Parsers dont make you do more damage, they just show your damage output. Doing good damage is independant from parsing.

It is however hard to gauge your own performance without those tools, but that is an issue with the game, not necessarily with parsing. The game doesn't tell you anything about your performance, it doesn't tell you if you're pressing your buttons in the correct order or not because there is basically no feedback from the game itself and no, the enmity meter is not in any way useful for judging your own performance.
The only somewhat useful implementation in the game itself is Stone, Sky, Sea and even that suffers from tuning issues that can make it impossible to beat on certain jobs, regardless of how good your dps actually is.

So while parsing is in no way required for good dps it is often the only way to know whether you're doing good dps or whether you have to improve.