The problem isn’t 40-90% agreement ... it’s what is the 10-60% disagreement?
When you can’t be certain about how a RINO is going to vote - you might just as well have a Dimo in the seat. You can be absolutely certain how they will vote.
I wouldn’t consider voting for somebody I agree with only 40% of the time. I have never found a candidate I agree with more than 90% of the time, and that includes President Reagan and Senators Goldwater and (James) Buckley.