If he thinks it's boring it's likely because he's on APS-C. 50mm is my favorite focal length on FF for sure, and I would wager most people's.
Nope...I use my primes (15/2.8 fisheye, 35/1.4L and 85/1.
almost exclusively on full-frame.
But on APS-C it feels around 80mm... this no-man's-land that is just too short for portraiture and there's no sense of depth from either compression nor from natural space rendering.
So, the 85/1.8 and 85/1.2L on full-frame must be no-man's land as well. There's no appreciable difference between 50mm on APS-C and 85mm on full-frame.
I've shot portraits from 15mm fisheye through 600mm. This idea that 80mm-equivalent is "too short for portraiture" is just total baloney.