Hello Agus. Have you ever changed your vote when you vote for the national elections or for anything? Do you have idea what chaos that could create? Not even in ancient Greek Athens which was the center of the democracy that was possible and could divert the society from democracy to ochlocracy according to Plato. google the term. It’s a recipe for chaos and catastrophe.
As an example can you imagine people voting for Biden and then the next day to change their vote and vote for Trump?
Once you have cast your vote or you have designated a delegate then its over. People should take ownership responsibility of their decisions.