Proficiency per Long Rest is too abusable at low levels.I hate it as it can't be counted on.
prof bonus per X or fixed amount based on class level per X is much more reliable, as this can swing from 1 to 5 uses and then you are in balance problems.
It't more that enough that abilities are determining AC/DC/attack/saves/checks, they should not limit fun(number of usages of abilities).
and it's completely inconsistent.
Tasha's did it much better.
it's either:
1 per X
prof bonus per X
2×prof bonus per X
1(2)×level per X
it's an amount you can count on no matter how good or bad you make your character.
Nature's Veil could use it as it was post level 10.
Dread Ambusher at level 3 100% could not.