How the user mashing random keys a SW defect? The SW does what you tell it to do.

Random mysterious keybinds that nobody asked for

Every OS has it's own keybinds. It's not their fault you don't know them.

I know the keybind to switch languages. I'm ok with it. I'm genuinely asking why Windows is adamant that I must have more keyboard language options than the two very specific ones I want.

If enough people are unaware that they're telling the software to do something and are confused by its behavior, then the software needs to better indicate what it's doing and why.