Question, why does Bard and Machinist share the same core mechanic?

[Voltyblast]

In my previous post I mentioned how the two stances aren't really mechanics but, simply put, badly implemented gimmicks that renders them casters. So I thought that, what about making those two stances with a mechanic? I mean, an ACTUAL mechanic?

I had these simple ideas that could somehow work and would still force them to be a still, however without the need of having cast times:

Gauss Barrel: remove the casting time but increase the damage of the MCH by 5% for every X second that he/she is hitting a target - essentially making you a nuking beast but bad at add management. The buff is removed when switching target.

Wanderer's Minuet: remove the casting time but increase the damage of the BRD by 5% for every X second that he/she is standing still - rendering them the idea for add control but less for movement-based mechanics. The buff is removed when moving.

Of course these are just my take but think about it: with these 2 hypotethical stances they'd actually have proper mechanics implemented into their new buffs and without having the nuisance of casting their skills.
I'm 100% sure I won't be taken in consideration or someone will say this is OP (well duh, I'm not a programmer) or that they're fine as they are, but I do think that something like the ideas I've put could be both beneficial and interesting to have.