I am glad tho we have gotten the discusdion focused down to the assessment of how impactful this ruling is to one specific table and its particulars, even for one particular players one character at that - as opposed to making any claims now about its impact anywhere else.
In order for the shove and run tactic to work pretty much all of the following conditions have be met:
A) The rest of your party is ranged, and is more than the enemy's movement speed away after the shove.
B) The PC must move as fast or faster than the enemy. So too bad dwarves, hope you aren't fighting a monster that has better than your base move.
C) This can be the only enemy threatening you. No other enemies adjacent when you flee.
D) The enemy either came to you or it's not the first round so you still have your full movement.
E) There's someplace to shove the enemy so they are farther away.
F) You are in the open with no obstruction to movement and everyone can use their movement every round to get away without provoking themselves.
G) The monster can't have ranged attacks
Huh. In all my
years decades of playing and DMing I've rarely had a fight that all of these criteria were met. So this tactic may work at
your table, but I don't remember an encounter it would have worked at mine. I'm old, and may be forgetting one so I'll say the tactic is pointless 99% of the time in my experience.
Kiting the monsters can be a valid tactic if you're a swashbuckler. If I wanted to use this tactic that's what class I would choose. I would also be accepting that the monster is probably just going to attack someone else. Like a guy with high armor class because they have armor and shield.
Last but not least, I don't think the feat is completely worthless, it's just worth less than an ASI or several other feats.