It's not exactly noticeable though, so I don't know if it's totally worth it though
Well, engineers are always going to brag about how much fancier their new code is, myself included.
Though I understand users saying it's not worth it, albeit a bit discouraging.
You can just care about what you actually feel, discarding the underlying technical advancements as those might be particularly unnoticeable for you.
Actually, smoothness is not even close to the stock kernel. It needs A LOT more refining to do, no offence to anyone, I hope.
Try using Twitter for a few moments and that'll look like a stuttery mess. I just can't NOT notice that.
The difference to ext4 is totally unnoticeable in day to day use, unless people know specific ways to exploit it.