As @Shog9 mentioned when originally implementing 3-vote-close:
[Previously], migrating a question to another site require[d] that 4 of the 5 votes all agree that the question should be migrated to a specific site.
As migration would be blocked otherwise, I'm also temporarily lowering the threshold for migration from 4 votes to 3 - essentially making a migration require unanimous agreement from close voters. (emphasis added)
When there's a good windows-subsystem-for-linux/wsl2 question that would be suitable for Super User, I vote-to-migrate and toss a cv-pls into SOCVR as well, but usually these get closed by (I'm assuming) a single "Not about programming" vote. I know that my personal "muscle memory" often pushes me in the direction of an "Off-topic" vote when I should have at least considered migration.
Is there any reason that the bar couldn't/shouldn't be dropped to 2-votes-to-migrate? This would keep intact the original spirit of allowing one "other" vote to not derail the migration.
Of course, votes-to-migrate should be carefully considered regardless. Only good, suitable questions should be migrated. I'm not proposing that we lower the bar on the quality of questions that are migrated, just that we accept two voters opinions on the suitability.