@freemo you’re leaning heavily into a strawman argument here, a very common one.
A vote is an expression of a stance. What you’re proposing is that we should take various stances and just funnel them all into one stance that will in many cases be completely opposite to the voters’ own positions.
For example, I won’t vote for either Biden or Trump because I believe both parties need to nominate better candidates. They must if they want my vote. So many others share my position.
We hope that the parties, particularly the losing party, will take that position to heart in the future.
BUT as different people will frame our position as support for either candidate, instead of rejection for both, is to get our position exactly backwards AND miss the call to change, to put forward a better nominee.
The strawman argument of voting for something instead of rejection substitutes what we actually believe for something completely backwards of what we believe, missing the call for a solution in the process.