I think it is different in high school and college that freestyle. Can you imagine explaining to casuals, parents, etc. why some of the periods start on the knees and leg takedowns involve going to a knee and guys often get stuck on their knees in unsuccessful shots? "But I thought going to your knees was illegal?"
Then there's the problem of how you referee or write the rulebook for an Anthony Robles, Nick Ackerman, or Dock Kelly. You don't see a lot of guys like that, but keep them in mind when writing the rules.
I think we are fine as long as we make guys on their knees be active, don't run, initiate attacks, etc. I mean: They are right there for you to use your short offense on.
Those are my opinions as someone who has been a college wrestler, college coach, high school coach, fan, parent, and ref. I'm not perfect, but I do think about stuff from multiple perspectives.