Horwath
Legend
Since AC does not scale with prof bonus, so most saves should not.If you're having to roll an 18 or 19 to save with your worst saves (or higher), this change that number to 12 or 13. I don't think that's unreasonable for a worst save at high levels when any save failed is likely to be highly debilitating. Since spellcasters get to add proficiency to their save DCs, this merely helps players tread water on their worst saves. Realistically, even with proficiency characters will still fall behind since they're not likely to bump their worst save stats to 20.
Spells get more reliable as levels goes on, unless you target that specific save.
there are few solutions to failing too much on spells;
1. Make resilient give two proficiencies and make it so you can take that feat twice. One save must be from dex, con or wis and other from str, int or cha.
2. make hard crowd control effects on failed saves little bit weaker, so players are not out of the game for several rounds.
3. don't dump stats
4. my suggestion on ability usage:

Using abilities for only ability checks.
Yes, an idea to remove most effects from abilities so the only affect ability checks/skills. Have abilities only have mostly RP value. all combat is based on your level. In all other aspects of the game; attacks, saves, damage and DC's, ability mod would be replaced by your proficiency bonus...
