[hoten]

It's important to note that glitches that speedrunners utilize are often game breaking bugs that would give a normal player a really bad time. And it could be that the obvious utility of the glitch (like item duping) could also have a less useful manifestation from the same buggy code (crashing the game).

There is a video on YT with a speedrunner walking the Portal team through the speedrunning community's hacks, and there is a part where this is touched on.