Every time James Yaeger posts a video, the firearms community gets dumber. There's a reason he disables likes/comments and none of the other major YouTube gun guys do. I even respect FPSRussia more.
The guy gets under my skin in just about every way possible. Factually questionable and sometimes downright irresponsible advice mixed with a constant smug. sneering demeanor.
So yeah, I also figured you must have seen the Yaeger video.
.40 does not suck. Neither does 9mm, .45, or .357. Energetic arguments to the contrary are symptoms of too many dudes with small units owning computers. They're all effective, useful cartridges. Pick one and be happy.