I asked this same question in discord 3 years ago, i see that it was unstable then, but i can't say its unstable now, and can you define unstable?, like game performance issues or loading zone issues.
The game might not run at 100% speed (might be faster sometimes, might be slower most of the times) because the emulation of the Espresso CPU in the WiiU is far from perfect, and I doubt it'll ever be close to perfect. I'm surprised the playstation and some dolphin games are as good as they are, but emulation is difficult, and therefore not accurate.
Also yo, only Dutch people are allowed to talk in this thread. Gekoloniseerd
Thanks for explaining, and yes thats true, i'm also dutch.
tried to delete the post but deleted my own comment LUL
Nobody is forcing you to buy a wii U. If you want to do runs on emulator, do runs on emulator.
You don't need to follow the rules to be able to do speedruns, that's the beauty on it.
But due to unfair stuff, don't expect to be on the leaderboards.