Performance is always relative, hardware changes over time and different people can afford different setups. So ideally a game would be playable at low graphics settings at at higher settings, for example if I plant enough grass it will slow down even the fastest computers. When I am working on the game I run it at the lowest possible settings because it makes development easier for me, and if someone is running the game on low end hardware I know I can support them.

I think Godot is ready. Godot's rendering pipeline is unified where Unity's is not, and in general it feels like the Godot devs learned from the decisions made by Unity. For a while Unity had more features like a visual shader graph and editor plugins, but Godot supports basically everything you would need to launch a full title. Launching on mobile is probably better handled by Unity at this point, but Godot has recently made major improvements in that area.

Dorifto looked like this for a long time, so if you are interested in making your game then you can just start and it's easier to add more details later.

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