Ya I mean I agree solo shouldn't just be 100% better. I just wish there was a way to normalize legendary gems mainly somehow. Paragon can be a thing where you put more time in and you have more damage. Maybe it shouldn't be 5 stat per level, but that is a completely different issue.
I would be down with Regular Rifts gone and having Bounties give Keys and GRs only focus on legendary gems and legendaries. Also, maybe make all the exp from a GR from the turnin only and nothing from the rift.