I think it really depends. I'm someone who really likes to soak in a game's atmosphere or learn all its nooks and crannies but I'm not the biggest fan of are speedruns that rely too heavily just glitching or breaking the game or on speedruns of games that were purposely designed to be these long 40 some odd hour RPG experiences you're meant to play in several sessions and so the only way to speed run it is to just mash the a button to skip all the dialogue and phase through a wall. Just seems a waste of time (ironically) to learn to speedrun games where time attacking was never a part of its overall design. But for games where it was (Super Metroid, Resident Evil, etc.), I think it can be cool to see all the strategies and tactics I may never have known about, but even there you will inevitably reach a certain point where there's almost no way to get a better time playing it as the devs intended and at that point you're just glitch hunting, not so much speed running, if that makes sense, which is cool in its own way, but the "speed run" at that point feels more superficial.