DND_Reborn
The High Aldwin
It isn't about trust--either issue. I fail to see how level drain has anything to do with trust (but haven't been reading all the posts so its a non-issue for me). Level drain was part of the game back then, that's all there is to it, including it was part of the balance of the game. It wasn't added later on to increase the power of the undead over the players. Removing it was the reverse of power creep really in later editions. Since the established game (5E) lacks it, adding it back in would be re-establishing the prior balance. If player's don't want it, then you could argue it would power creep against the PCs...If level drain was fine because the players just had to trust the DM, then power creep is fine because the DM just needs to trust the players.

Power creep isn't about trusting the players. Trusting them to do what? Not use it?
Power creep is about changing the dynamic of the game in an impactful way which leads to imbalance. If the DM allows it then that means they are accepting the responsibility to adjust to the new dynamic to compensate for the imbalance OR they are just willing to keep the status quo and allow the imbalance to exist.