Necropolitan
Hero
If you feel like the DM is abusing or will abuse your Warlock's Pact then you shouldn't be playing with them.All that aside, if some of us are a bit paranoid of DMs using the pact due to setting logic, can you provide an example of what you would do as a DM of a warlock player? If you have and I missed it I apologize.
The solution is to encourage good DMing, not take away the DM's powers.
It doesn't matter what the rules say, bad DMs will find a way to be bad DMs. Should the Dungeon Master's Guide say cave-ins, landslides, and meteors don't happen because a DM might do "Rocks fall, everyone dies?"