Shove, shove, shove.. pits, lava, lethal falls in every fight... so sick of it I can't really be bothered to write about it again. It ruins tactical combat rather than adds to it when it's stupidly OP like that. Nerf the distance and action economy already!
With all the ways shoving can instantly kill a foe or give you significant advantage, you'd think it would count as a full action. It just makes sense that the benefit of an action should be proportional to the inherent risk of the action, which should be represented by how much of your own resources (action) it takes up.