I don't really like 5e saves too much & they are made more obnoxious by making it so they aren't really something you can target any more. Take a troll, in the past a caster could make a reasonable guess at an opponent's weak save(s) & it made a big difference. Now you might see a few points of spread sure, but the caster doesn't feel like there's much reason or benefit to do anything but not target an obvious save if there even is one