You're reading wrong, or only reading what you want to read.
Again: If you can find an Egineering profession item that allows me to battle enemies like this any tiem I want it, feel free to link it:
What
you aren't getting is that a profession isn't a class.
Simply mixing 2 unoriginal elements in one class doesn't make it an interesting class. A shaman that happens to be able to wear plate armor might be exclusive in the way that it's the only class that happens to be able to meet that very specific requirement of "having elemental spells" + "wearing plate armor". It's still just a shaman, it's "thing" is still using elemental spells to empower his weapons or to deal damage and what not. Other than that, what's the difference to the player? How will playing enhancement or elemental be any different to play just because you happen to be wearing plate armor?
A plate wearing elemental caster wouldn't be original, unique or interesting, just like a Fury Warrior wouldn't stop being or feeling like a Fury Warrior if suddenly they could only use leather armor and not plate.
There is no class or profession combination that allows you to use rockets, lasers, mechs/exo-skeletons, explosives and other mechanical gadgets to continuously engage in battle.
I'm not claiming the idea of a tinker, or of a rocket, or of lasers, or of mechs are original and new to the game. I'm claiming a Tinker as a playable class, whose mechanics revolve around a combination of those things, is a class that plays unlike any other current class, offering fresh and new combat gameplay that you can't reproduce even with engineering.
Sorry if you can't see that, but if you can't or are not willing to, I suppose there's no point in insisting.