Exactly the point die. People just aim for high dps when the ability bar couls be used for alot more.
Not sure I quite get what you mean, there's more to it than that. The most prominently used armour in bossing situation is the ports armour (Tetsu, Seasinger and Deathlotus) which are tank armour, so that's not max dps. There's hybrid armours, power armours and tank armour. If you're maging you have to consider wether you want to use a one handed staff or a wand with either a shield or a book depending on if you need tanking or max DPS. Same with ranger if you want to dual weild or use a one handed crossbow. You should actually give the system a try before pretending you know what you're talking about.