i mean she losened up the earth,
That's one way to read it, but that isn't how I read it. The way it makes sense to me is that she ripped up all of the easily moved earth and now only has much tougher and harder-to-move bedrock to pull up. From that point of view, the current design makes much more thematic sense.
second, it would kinda make sense gameplay wise if she was restricted to using her barrage on worked ground, but could use it more often to waveclear or attack.
That seems like an assessment made entirely about laning. The potential benefit from laning is minimal (and really, I think having the limitation on her very strong poke/waveclear is probably healthier), but the costs to everything that isn't laning would be huge. Her Q would be worthless anytime she roamed, which she is heavily incentivized for doing. It would be worthless anytime she was chasing or being chased. Gank someone? Q is bad. Ult in? Q is bad. It would require her to spend a lot of time preparing potential battlegrounds before fights, which sounds more like a boring chore than an interesting mechanic. It can already be a bit tedious on Illaoi and Zyra, and they have the advantage of doing it automatically.
I just see so many downsides to this, and only one very small benefit. We'd have to majorly rework her kit to support this change. I don't think this is a good option for her.