Nope, do the whole thing, or not at all.
I remember not too long someone said exactly this and proceeded to get torn apart simply because it wasn't content that person personally liked ..
The problem is, if you're late in your weapon progression, it's virtually no chance at all unless it's a 0.x% or 1% chance (I and many others keeping data have yet to see a level up once your weapon and armor are 27+ on floor 1-30), it's not simply reduced. It's not that it's hard, there's literally no benefit to redoing it once you're nearing the end of your weapon because the exp bonus for leveling a new job isn't that great as of yet so once your tomes are capped off, you're basically going to start running into:
People that will make things aggravating because they want to get back to the set of floors that will actually progress them. So using it as an alternative to regular leveling dungeons, go for it, but majority of people are going to use "Matched Party" for at least 1 slot (don't even try solo, you're not getting anywhere over floor 20 unless you have ungodly luck.)
Did this with a few FC mates last night. Cleared floor 20, and we're going back in tonight to continue our progress.
Gotta say, I don't see the hate.
As said, once you complete your first run and your weapon/armor no longer levels until the last 2 set of floors or even complete your first weapon, you'll understand better where a lot of people are coming from. It's not even just me, a lot of people said that's their main problem with the system, so no one really "hates" it, it's just a VERY common sense quality of life function that almost every other MMO has because when you're grinding the same set of floors 5+ times to no benefit, that gets repitious far quicker than an ex primals, because sooner or later your tomes will cap out so you're literally only doing it for 1-2k+ until the final 20 floors. At least with ex primals you're gaining weapons for desynth, synthesis materials or mounts lol. Heck even Shards are abysmal drop rates outside of the final boss so can't even really grind it for that.
Excited to see how SE builds on this. If the difficulty progresses according to how it has been, then I think everyone should be happy with floors 100 to 200. In the meantime, this content was never intended to be a part of XIV's endgame
Funnily enough, it's quite the opposite. Unless they change how they handle data, people are actually worried about floors 100+ because you'll have to start from 1 again to progress upwards to 100 so if you happen to wipe on 99..guess what no one will want to do? Especially if they are actually challenging...it would hit people harder than A6S where you have to start the entire raid over if you mess up 1 mechanic and cause a wipe. The system is fine for what it is, that's just a very glaring problem. If there were more to floor 1-30 it wouldn't be too bad, but as more and more people start hitting that point it'll start showing up a lot more on community forums.
Heck the VERY FIRST complaint about it was how you could literally end 1-10 and not be able to do floor 11 because you didn't get enough silver chests and have to redo it again - No matter how you slice it, that is a problem that can and will turn people off. I'm not even saying that's a bad thing, but it's just those little things they should have looked at because I know a lot of people who wiped on floor 39 no want to even try the content again when they realized they have to start from 1 each time they clear 50. Having floor selection is perfectly fine, because every other content that is "tiered" lets you select, i.e Alexander, Coil (as of now) and Primals. I don't care about how easy it is, it just feels like something is really off with the "end-game" of it, since grinding isn't even the problem, it would be cool if regrinding 1-30 actually offered something you know?