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.