You shouldn't suggest something you can't explain.
WHen you want to transport like mushroom cow fo´rom mushroom island to your base. So its not over powered as well, taht you get that egg eevrytime and get xp from the killed mobs and stuff. Also you can use em on pvp, by deploying like zombies so they will always attack the enemy first, not you. The guy who spawned the eggs, they get attacked after killing the spawner's enemy
What's with this jump between spelling things right and wrong? Yeah, saying something is not overpowered magically makes it balanced. Uh huh. There's a reason why spawn eggs aren't in survival. no support.