Tony Vargas
Legend
Scale bad saves with level at the same rate as proficient ones - (so Proficiency -2, in essence).Probably been asked elsewhere, but if you could change/fix just a handful of 5e things, what would go on your list?
Scale save DCs with slot level instead of character level.
Make it abundantly clear that the DM can (and should) vary the time it takes to compete a rest, and whether a rest is possible, with the pacing of his campaign and the circumstance of the adventure, to make it more natural for the DM to maintain the 6-8 encounter/2-3 short rest/long rest point at which the game theoretically can be balanced - include a fixed-pacing variant for that, in which short-rest recharges simply happen after every-other encounter and long rests recharges happen after every 7th encounter.
Tweak MCing:
Assign ASI's by character level, not class level. (Bonus ASIs still happen at the same class level.)
Classes that give Extra Attack combine levels to gain that first extra attack, and fighter levels can continue to build on that.
Re-cast some sub-classes, like the PDK, Battlerager, Bladesinger, &c as setting-based PrCs.