I agree, but you will never get as big or dedicated of a tester group as you do on live servers. Putting in some borrowed power as an optional thing forces the entire playerbase to engage with it in one way or another, which is the only real way to get honest feedback at scale.
I think any of these borrowed power systems should be FAR more deterministic, rather than RNG on RNG on RNG to get the item you want, with a socket, with the corruption you want, in the amount you want.
That doesn’t mean borrowed power in general is a bad thing.