You're proving my point about game play and fun.
You didn't have a point about gameplay and fun. Up until now your argument was about what abilities worked best for a role. Now you're talking about gameplay balance - that's the opposite of what you were getting at.
Control/Aggro/Death from Rogues are the limitations that traditionally make playing a ranged caster fun. A mage should have to "run" away from a giant trying to bash it or a rogue. If you remove the risk of death, by hacking the builds + gear, then you make the game 100% boring. Might as well just type in a console command to kill all the mobs.
You'd have a point if the KE 'removed the risk of death'.... But it doesn't. A hybrid ranged/melee KE plays a little like a Mass Effect Vanguard in that's risk of death is tied to how much agression it has. Played perfectly, yes, it can survive heavy damage, but that's true of anything.
Arguing that playing a hybrid KE is equivalent to just using console commands implies that you have no idea what you're talking about.
You are talking about producing a mage build that does it all. Melee/Ranged, with high defence, large mana pool, and high DPS. To me that is 100% boring. If wanted to be able to just walk in and kill everything, then instead of wasting my time with builds and gear I would just put the game on easy mode. From a "fun" perspective there it little difference.
Not at all. A KE is flexible enough to work as a hybrid but it can't do every task - a ranged Nuker/melee can't handle squad support, for example. To be honest it sounds like you're quoting from a wiki rather than any experience, so I'd suggest that you put some time into experimenting with the spec before slating it as 'not fun'... The KE has a funny habit of mirroring its user's imagination in that it plays as interestingly as one wishes to play it.
As for 'fun'.... What one person finds 'fun' may be different to what anyone else does. It is irrelevant to the argument you were making above, which was based on what abilities worked best. One minute you were saying that the KE can't do this, the next minute you were saying the KE is boring because it can. If you find the Rift Mage more 'fun' then by all means, fill your boots - but don't dress it up as anything other than that. There are people looking for advice on these forums, after all.