Step out, shoot, cover. Totally cool for me, but if this should be avoided, then it is an issue with the "move-act-move" rule.
Hit & Run tactics - also very cool with me, but if this should be avoided, you could (and in my opinion should) do so with a seperate AoE rule (like the suggested granting advantage for retreating from melee)
I think both of thouse should be encouraged by the rules.
The only concern I see is technically you can have a carousel of goblins all moving and attacking one person theoretically in the same 6 seconds, which is frankly silly. But that is really an artifice of the Initiative system, not move-attack-move.