You HAVE to let players go back a step or re-select a decision when it has no immediate effect
It's ridiculous that I can misclick on a Multiversal Passage, choose the wrong color by a millimeter, and that decides the game. It is literally part of the Magic rules that I could pick it up, choose a different color, or even play a different land.
You have the timeouts for a reason. If players want to fiddle until they timeout, that's not meaningfully different to them roping; hey, you also have the player report tool now! So, take-backs MUST be implemented for certain things, particularly lands.
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