I agree that Toys and Rocks are the best Aerosmith albums and if you don't like them then you can just stop. I guess I'd be curious to know if you think Rock In a Hard place is substantially weaker than the 6 before it, since that's the album with the two replacement guitarists. It has a mixed reputation. I think the songs are good, and the stand-ins do a good job, but there's a chemistry to the band that's not all there.
Re Ozzy's live vocals in his "old age," the Reunion album is 25/26 years old and this point (concert date/release date), and Ozzy was performing the day after his 49th birthday, which no longer seems old at all. His voice sounds very good, if you like it on the studio albums you'll like it there. It's just that some of those songs were hard to sing, so they either weren't performed or, in the case of Sabbath Blood Sabbath, were sung in a lower register. He didn't screw up anything he tried to sing.
I don't know what he sounds like now, but it's past the point where I would pay to see him. Setlist.com doesn't have any full concerts listed after 2018. Looking at those last few shows, there are no songs newer than 1991 (not a bad descision).