Mouseferatu
Hero
Almost every spell that does something other than cause a single quantity of damage allows not just one save, but multiple. Save every round to end.
As things already stand, it's trivially easy for anyone proficient in a save to make that save most of the time. The only time these spells/effects are ever worth using is when you can target a non-proficient save, and even then you're only likely to get a few rounds out of it.
When it comes to damaging spells/effects, 5E allows for the bounded accuracy of attack modifiers and AC by making damage and hit points the traits that advance dramatically as you level. Granting everyone good saves dramatically knocks down the damage potential of a great many high-level monsters. You have literally, by the rules, made them lower CR monsters.
Could all the above be mitigated with additional house rules? Sure. But taken on their own? Well, as always, play how you want, but you're tipping combat, almost across the board, in favor of the PCs, and not by a trivial degree. That strikes me as quite un-1E, honestly.
As things already stand, it's trivially easy for anyone proficient in a save to make that save most of the time. The only time these spells/effects are ever worth using is when you can target a non-proficient save, and even then you're only likely to get a few rounds out of it.
When it comes to damaging spells/effects, 5E allows for the bounded accuracy of attack modifiers and AC by making damage and hit points the traits that advance dramatically as you level. Granting everyone good saves dramatically knocks down the damage potential of a great many high-level monsters. You have literally, by the rules, made them lower CR monsters.
Could all the above be mitigated with additional house rules? Sure. But taken on their own? Well, as always, play how you want, but you're tipping combat, almost across the board, in favor of the PCs, and not by a trivial degree. That strikes me as quite un-1E, honestly.