you might want to doublecheck your post here.Don’t lie about me, please.
I never said or implied any such thing. Hell, what I said directly precludes such a thing, as I mentioned apprenticeships and the like.
On the other hand, it very much is the case in Eberron that magewrights are not unskilled laborers. You can run it however you want, but in the actual canon Eberron, a magewright is someone who has attained professional rank in a magical trade skill. They are not entry level workers.
It's not saying that magewrights are unskilled laborers to say that magewright includes lower skilled trades. A farmer doesn't need to be "unskilled" to to have a lower skill barrier of entry into the job of being a farmer than transplant surgeon rocket scientist or even a nuclear power technician.
More relevant to your original claim about training someone to "operate" a cannon in a couple weeks compared to not being able to do the same with a siege staff or similar because "Those are vastly more expensive, and becoming a magewright takes years of training." (yes those are both things you said and by saying them in the context you said them responding to other posts you implied things). You are comparing two wildly different levels of skill to make room for gunpowder cannons in advanced worlds like eberron. A soldier doesn't need to be a fully fledged bombardier magewright with years of training to smash a globe on a plate & do the things you spent a couple weeks learning to fire a siege staff in the right general direction any more than it's required for a similar level of proficiency with cannon operation.... both are likely to be a bad shot & maybe even maim the wrong people, but both are similarly skilled. A soldier might not even need a couple weeks to simply fire one of those if they've seen it done up close & feel like the risk of blowing themselves up is justified.
It's not reasonable to justify the existence of a cannon alongside things like siege staffs by comparing someone who can load it point it in the general direction & light the fuse after a couple weeks of training with a person who spends years of highly specialized training to operate arcane artillery with reliable precision. That's like comparing someone who completes a CPR course in a couple weeks to a lung transplant surgeon.