While player.addperk works when given a correct hexadecimal perk ID, player.removeperk does not. I tried all sorts of things and the perk is never removed. The console window gives some unexpected output, like:

WornHasKeyword >> 0.00

GetGlobalValue >> 22.91

I'm using the PC Steam version, on Windows 10

The console isn't officially supported, so calling it a "bug" is a little misguided.

Using console commands is always an "at your own risk" sort of proposition. It's entirely possible that Bethesda did something with removeperk and just left it as-is because players aren't supposed to be using it.

Odd, it just worked fine for me. I switched from 5/5 melee (buggy and clunky piece of junk) to 5/5 Heavy Weapons(Based face-roll). And blacksmith to gun-nut.

After doing so damage values were proper.

My exact command is

player.removeperk 0004b255

to remove Armorer Level 2. What was your command?

Ah, I see now. The Perk UI is not updating. But if I save the game, quit to desktop, and relaunch/reload, then the perk is gone.