2. You're talking about pvp? I wasn't, yet it still applies, the only hard part about mes in pvp is getting 4illu shatters off and oneshotting people...
Keeping track of that (ele) stuff isn't harder than keeping track of other things, good indicators of time are how long your attunements are on cd, most "timing" comes natural if you practise a bit.
Knowing your skills is crucial for all classes, it doesn't matter if an ele can bring 10more skills to the table than another class since all classes need to know all their skills anyway.
Atm both mesmers and eles are one trick ponies. They try to burst you down quickly (just like thieves) if a mesmer fails he's gonna die soon, an ele won't die so fast since they're incredibly mobile and have good base of healing skills to help them pick themselves up after a fight to have another go.
Your way of comparing complexity is weird, you start off with saying "a bad warrior" and then compare that to "a good mes" and "a good ele" yea ofcourse a bad warrior will play in a very dumbed down way in comparison to a good anything else.