If there was no skill component to this game, there would be little variation in DPS/HPS/tanking ability. On the PvP front, the better geared team would always win, guaranteed. Nobody would have trouble with mechanics.

But that's simply not the case. And if you think the only differentiating factor is time invested, you can't play with a lot of people. You will see exceptional DPS who destroy everyone else despite never having done the fight before. You'll see people who have done a fight fifty times still screw up on the mechanics. And no, it's not just about memorisation. You need to know how a mechanic functions in some cases, but you can deal with almost all mechanics purely by reflex. Twintania divebombs were basically the only mechanic which annoyed me as you had to actually memorise a specific movement pattern.

Also, your transferable skills idea is underdeveloped. Warcraft and Starcraft for instance play very differently and while some skills carry over, being good in one doesn't guarantee you'll be good in another. It helps though.

And yeah, people who are experienced with other MMOs tend to find the mechanics in this one easy - mechanics teach you to adapt, maintain dps/hps while moving etc.

And finally, if there is no skill, post a parse of your highest geared job on a dummy (3mins+) - if there is no skill component, you should maximise your dps no problem, especially with no mechanics to worry about.