I thought there might be political tradeoffs to supporting Medicare For All, a policy *I* support but have questions about the political implementability of. Then I saw people tweeting that either you support M4A or you literally want people to die, which cleared things up!
This is beside your bigger point here but the "political implementability" questions are the whole purpose of M4A. If it was within reach we'd have to pick something else. There's an old Marxist saw about making all things show their teeth - that's M4A