There are two categories currently on the board that I never see anyone seriously running: Beating the extended levels in just one world from a new file, and beating the normal levels in a world from a preexisting file.

The normal levels, while in parts hard, should be feasible enough to just beat from a new file, and that's where the competition and the routing will be at. "Trivial Progress" NG+ would skip 20 minutes of the run and only be repeatable / allow file progress on 6 of the IL worlds, whereof 1-2 may still feature severe detours due to their difficulty. "Any Progress", on the other hand, is severely arbitrary (with no good F2P way to make it less arbitrary), and would take 10-20 hours of grinding just to set up an optimal file that will be unusable for almost all categories. All just for slightly faster builds - not worth.

The extended levels are (at least thought to be) so hard that it will take extended detours to gather up all the plants and bonuses for the builds that actually work. Doing this for just one world seems not worth at all, at that point you would probably just do an "All Levels" full-game run.

Extended levels NG+, however, may have a chance of eventually being run. Those are the few levels where using an NG+ file actually makes sense as even the "Trivial Progress" option will skip 1-3 hours of less challenging, and less reset-prone gameplay. "Any Progress" would be ready for a run after a finished "All Worlds" and "All Levels" run, without swarming the runner with 10 hours of trivial NG+ ILs. It would also see finished IL runs if "All Levels" ever gets run as "Purist F2P".