I think you're mixing up 4e with 5e...
IIRC, 4e still had the three classic saves, but they could be based on different attributes (Str or Con for Fort, Dex or Int for Reflex, and Wis or Cha for Will)... Which I actually like. It was one of the few good changes 4e made, IMO.
Even a broken clock is right twice a day, after all... As PF2 can remind us.