If the president is so powerless, then why are people worried about project 2025 and "dictator on day 1" Trump? Surely they must be confused, because the adults in the room like you know that the president is actually unable to pass meaningful legislation.

If Biden gave the order to eliminate his political opponents, nothing would happen because the amount of Biden fanatics is pretty low. Trump has enough fanatics in his ranks (which include a lot of military/police) that they would just do it, legality be damned. And with the current supreme court legality is a fluid concept in favor of republicans, and they know it.