Brightness and room fit
The 2,800-lumen brightness claim is the difference between a projector that only works in a cave and one that can stay useful in a normal home setting. That matters because it keeps the HC2350 in the everyday viewing lane for sports, TV, and movie nights instead of making it a niche dark-room machine.
The practical limit is that bright scenes and bright rooms still ask for realistic expectations. It is a better match for controlled evening use or partially lit rooms than for sun-washed daytime viewing.