See, I agree that coalition building is needed. Which is why reaching out to the "lol, evil uniparty" people is a waste of time and we're better off going after normie democrats, since at least we can skip the "convince them that republican party actually exists" stage and just convince them to switch sides.
Libertarian saw a bunch of narrow races where they could tilt the scales, and tilted them towards the dems, apparently on the theory that we would then want to bring them in next time. So screw 'em, they're not actually a big enough bloc that we need them involved, we should focus our efforts on building a coalition big enough that we don't need flakes like them to win.