As to your last point, I'm pretty sure that high ground extends the range of bows/spells.
I agree that the longbow should have a greater range, especially compared to the shortbow.
I am fine with the ranges of firebolt and eldritch blast. Firebolt is more powerful than 5e RAW, so I'm fine with its range reduction. Eldritch Blast is just powerful in itself. And again, both of these ranges can be extended from use of high ground.
2.) Any melee with a dash can get in your face, yes. But you can then freely jump-disengage away, so it's not as bad as it would be.
Yeah, this doesn't hold up any more. Firebolt is now exactly the same as it is in 5e RAW, except with a major range nerf, same for Eldritch Blast. And a melee character getting to your squishy casters is basically certain death for them, even if you disengage and move away the melee fighter is now within range to simply run you down again and hack you to pieces because you can't keep distance because of this stupid 60 foot range cap.
