"BTIZ" wrote
and I don't know of any "smart" instructor that would allow any student to
fly solo on any given day without the instructor knowing it and reviewing
that the student is prepared, has a plan, and has reviewed the weather and
forecast changes for the next few hours.

Then both I and the instructor who soloed me must not be "smart."
When I was soloed, it was three trips around the patch while the
instructor watched (and NOT with a radio) and then you're on your own.
When I solo a student, it's the same way. If I didn't trust the
student's judgment in making the go/no-go decision, I wouldn't have
soloed him. If I knew that due to lack of experience with certain
conditions his judgment in some specific area was still not
sufficiently developed, I would enter an appropriate restriction in
his logbook.

"Needs prior permission for each individual flight" is not an
appropriate restriction. The only justification for such a
restriction is that the student's judgment is not sufficiently
developed to make a go/no-go decision at all. That means he's not
ready to solo, regardless of how well he can wiggle the stick.

Michael