I wasn't being pedantic with what Carmack said, the use of a different word suggested a completely opposite meaning to the one you were suggesting, you were also implying this tool was "mantle" with zero proof.
You were posting something which taken as was, was completely the opposite of what you thought it was. This isn't pedantic in any way at all, it could have been a spelling mistake, which would have made your interpretation correct, though your implication he couldn't do Mantle better incorrect as game dev's will get dozens of tools a year from various companies. With new consoles out new tools should be dime a dozen at the moment.
I will, again not pedantically, point out that I absolutely IN NO WAY suggested this meant Carmack was incapable, which again your selective quote changing my meaning. Being incapable of improving upon a particular tool does not make him an incapable person in general.
On top of this you're implying that because SOME computers didn't have onboard sound, that gaming developed sound without sound output being possible. Not every computer came with sound, not every computer came with 3d accelerators, not every computer came with an OS, so what.
My first computer didn't have onboard sound, but had a sound card, the majority of computers sold are pre-built and every computer I've ever had, with no exception, had sound output. Soundcards were common before people started making sound for games, implying otherwise because motherboards didn't use to have onboard sound is... insane.