when you're making a game you should probably have in mind what you want to make your game for
if your game is a 2D game then it can infact run on a potato. people have gotten godot 2d games to run on old nintendo 3ds's but only on really really old godot versions.
if your game is 3D, godot isn't exactly perfect, but ultimately, it just doesn't matter.
i'd recommend you go make a 3D game for yourself and see whether it's performance is up to your standards or not. theres a lot of cool things godot can do for you in terms of 3D. I've yet to really test if any of my projects can run on potatoes because I don't own potatoes, but I don't own a high end system either, I have an integrated AMD APU and everything runs just fine, so if I tailor my projects to my system then in the long run things should work out just fine.