I never had a pre-CBS Fenders and other instruments from the 50's to early 60's, but all my 70's, 80's and later instruments have been perfectly happy with Rotosound SS strings.
Same here. I used stainless steel Rotosound Swing Bass 66’s exclusively on two different late 60’s Fender P-Basses for years. I had zero fretwear problems with either bass.
I can’t say the same thing about the frets on my ‘76 Rickenbacker 4001. SB66’s ate up its frets over about a 5 year span. I truly believe that Rickenbacker used a very soft fret wire during that time.