Full i110 crafted pentamelded is not better stats-wise than full i130. I don't see what you're getting at.
Right side doesn't even exist day one.
The only exceptions are bard and summoner perhaps and this comes from irresponsible stat distribution.
If we talk about intent and what things are supposed to be, then gear sets need to be thought out better, that's the real problem. Then crafted gear can serve its purpose - giving you an edge in early progression.
You propose to phase out a mechanic entirely without any evidence to how it's negatively affecting the game.
Show me the people that refuse to raid based on how they can just craft good gear as opposed to, you know, difficulty of the raiding to begin with.
Not to mention how if you follow this logic there's no reason to do any hard content at all as it will eventually be invalidated by the next ilvl increase.
And I've seen on reddit that some people when presented with "Crafted as BiS" idea go "I'd rather just raid than spend 10+ million on pentamelds". So what's harder here really?
Let's just look at the hypothetical situation here.
So you want to use full crafted gear. Okay.
First of all, right side doesn't exist until halfway through the raid cycle. That's the first problem.
Second of all, not all left and right side crafted gear is best in slot, in fact only few select pieces are best in slot, and even then only for some classes.
So in the end you still have to raid if your goal is BiS.
But let's say it wasn't like this, let's say you could make BiS through crafting anyway.
First, you'd need to advance enough in crafting. Or pay off a crafter advanced enough, which will cost you a pretty extra penny.
Current 110 crafted require various items from high tiers of gathered items, demimateria, as well as various soldiery items and also items that only come from raids or desynthesis of items from raids (yeah, easier raids, like ST and BCOB, but nonetheless).
You could ignore all that and just buy the materials - but the cost would increase that much up to maybe 0.7 mil per item now (and day one it would be more like 5 mil per item).
Then you'd need 55 grade IV materia of a specific kind, plus however much is gonna get burned by the overmeld RNG. This part, if not spiritbound yourself, is 20 mil alone.
You do the math but it's gonna range from 10+ mil right now to 50+ mil day one.
So much for that day one I guess?
And most people don't care about farming large amounts of gil. They'd rather you know, have fun playing battle content.
The amounts of ifs pile up on itself, and hypothetical BiS will of course also include a Zodiac Zeta weapon, which wasn't even available until the last week, so the best weapon was Dreadwyrm which, guess what, still comes from raiding.
And all that assumes the person in question cares about high-level gear, but doesn't care about actually using it on anything, which is a marginal sub-set of people that still haven't caught up with the idea of vertical progression.
I'll reiterate that this is all hypothesis that has very little to do with real game situations and real game problems.