Heck, it should only void the warranty of the fork, not the main frame. At least if people are thinking about materials. Not that legal logic does this

I've actually got a story which would argue for having these tabs (which my current bike thankfully doesn't). When I was 14, my mom dropped me off somewhere so I could bike home. I'd taken my front wheel off to put in the back of the minivan. When I remounted the front wheel, I apparently failed to shut the QR. This wasn't a problem until 1/2 mile from home, when I biked over a speed bump and my front wheel fell out of the fork, and the fork hit the pavement, wrecking the frame and putting me over the handlebars to break my left wrist. If the tabs had been on the fork, I'd have noticed to tighten the QR.