I guess what I would prefer - minding you comment about maintaining the correct range for ranged weapons - is the option to shoot if I'm in range, and move further away. Perhaps they're chasing me, whatever, but it just seems non-thematic and counter intuitive to say you can move and shoot but not shoot and move....
I differ on you call about making melee combat more interesting, to me it seems the opposite. It limits it to charging, staying and taking it or running away..
Balancing fast and elusive, probably, I guess it essentially makes them swattable, they've moved, taken a nip out of you, you've got the chance to splat them before they run off again.... but then if they're all that fast and elusive, it still seems like they could take a nip and then run off...
Well, to my knowledge, all non-spell ranged attacks require a full action so you can't move and shoot without extra spells to move your creature. You can move and cast a non-zone attack spell, but you also have to pay a premium of mana each time you do. It's just two different ways of approaching ranged attacks, each being better a different situation.
Overall, i think it just comes down to the fact that the way the rules are set up now in terms of moving are more intuintive than you think. It provides structure to a game that has a lot of ways of manipulating movements and action order to begin with (with QuickCast).
And really, you can accomplish the same goal of avoiding melee and forcing opponents into range using the QuickCast action anyway, what with the multitude of spells like Force Push, Repulse, restraining spells, and so on. Just activate your mage or whatever creature that has a ranged attack, QC one of those, and attack.
Your view on combat is clearly an exaggeration. In a match between opponents who are well-versed in manipulating Action Phase order, there is a lot of moving around. Sometimes you charge in and attack, other times you need to retreat; if you're consistently running away and not pressuring your opponent, there's probably something wrong with your build.
Finally, it's pretty easy to rationalize how ranged attacks work in a thematic sense; you need concentration to aim and fire, unless you spend some more mana to help you do that. I don't see how it's anti-thematic to need to actually take the time aim and fire a bow, really. If anything, it makes less sense if you imagine someone trying to shoot a bow while running. I mean, I've done archery before and it wouldn't be practical to run backwards (or any direction) if you have even a remote interest in accuracy.