Your warrants here rely on a certain point of obsession, though -- the idea that unless you specifically truncate a job (or, keep knee-high, however you want to put it), affecting everyone who may like that job for whatever reason (which will not be limited simply to its being knee-high), AND get perfect parity with far higher ceilings elsewhere, you cannot (be permitted to) play in peace at a simpler level.
But that's just not the case.
First, you can get by on less than full interaction. We do this already. No, it won't necessarily be optimal; your doing less may not equate to others doing far more. But neither would it need to. It's enough. And if engaging less with that excess of tools keep tighter on the mechanics and the core to the point you're doing better than you otherwise would... so what if there's more to explore as you grow more comfortable?
Second, why should the game have to pander, let alone at broader expense to others in balance, to someone wanting to take the easy way out in competitive group content?
You want something that you can easily sub into Savage groups with without needing to particularly know or practice your job? Okay, I can get that. That may sound great to/for you. But why would that be better for the game to let you do so? So long as the game's checks are lenient enough that you don't to have to bother with the excess, why should the game prune away or cap the excess of tools that others would enjoy just so that you don't have to see it?
Moreover if expectations were so tight as to require every player to well engage with every tool at their disposal, you do realize also that any job which can hit the same peaks more reliably and with less effort would start becoming obligatory, no? If the situation is tight enough that you'd be harassed into engaging with more than you like, so too would players be harassed into picking easier, less "egotistic" picks.
If even a first time clear group of randoms will be held to such high standards that excess is essentially impossible (the guy who can't even dodge will somehow be yelling at you for not using Soteria on cooldown or letting EuDiag fall off for a few seconds), the imbalance your asking for (to do the same for less) will be a problem (one that will essentially relegate us from 4 rather simple and kind of wonky healers to effectively just 1 mainstay healer, which happens to be rather simple and kind of wonky). And if not, then what is possibly the problem with using just some 70% of a kit (for some 85% of your potential value) on a fight that only requires some 60% of your max potential in order to clear?