Depends on what you are using the gun for Warp. Informal bullseyes at the range - regular cleaning probably not necessary....competition, self defense, duty, - Why wouldn't you clean it?
Olympic skaters sharpen their skates before every skate for one reason...they work better that way. Even if the benefit isn't noticeable, it puts them further away from the point where dull skates become an issue.
Not only does regular cleaning put your gun back into the condition in which it was designed to function, it gives you the opportunity to inspect it for wear an parts breakage.
I might not clean it because it doesn't need cleaned.
I don't carry enough ammo to where the gun being dirty will become an issue. Even if I did I would probably be seriously injured or killed before I could fire that much.
Everybody else is free to clean their guns after every couple hundred or whatever round range session, but when I shoot a good proven duty type pistol for a typical 200-250 round session I don't see a need to go clean it. If I won't be shooting it again for awhile I might do the quick clean and add a little oil, or I might not and wait until the next time or two I shoot it.
I understand that it doesn't hurt to clean/lube it and the "why not" is how I used to do it. But now I shoot more often and cleaning the gun every single time, just don't see the need.
I have two carry guns that I haven't cleaned since my last range trip, right now. I plan to shoot them yet this week and will probably wipe them down after that.