It's a team based game. Even if Shove was an attack action, level 1-4 Fighters can Shove enemies prone for their team mates to get advantage even if they can't follow up with an attack of their own. Assuming they will implement that at some point. It's a good tactical move so obviously they should.. and there's no reason not to.
And leveling up and gaining new abilities is so fast in the beginning going all in on figuring out a million things for low level Fighters to do seems a bit pointless. In 30 mins you are an Eldritch Knight with spells or a Battlemaster with Action Surge, Second Wind, Menacing Attack, Pushing Attack, Rally....
Positioning is important in 5e as well which adds meaningful choices for low level Fighters other than just attack. Which enemies to engage, where to block enemy movement, which party member to protect.. just Larian decided positioning isn't going to be important in tactical combat and gave everyone a Bonus Action Disengage and handed out Teleport abilities like candy even if the battlefields are already vast open spaces that are impossible to control.
