Return to 3 saves would be far superior.
Fort save: str+con mod, current str and con saves.
Ref save: dex+int mod, current dex saves.
Will save: wis+cha mod, current int, wis and cha saves.
then point buy for "cheap" scores would have better saves for not having primary/secondary ability maxed out at start.
I.E. with racial +1/+1/+1 bonus you could have 16,16,16,8,8,8 and 14,14,14,12,12,12.
That would give on average +1 to each of 3 saves.
Then every class would get one save proficiency and resilient would be again more or less save valued feat as it is always taken for Con or Wis saves.