Voluntary severance/ERO is possible without a bad culture. I’ve seen it done, people love it.
Personally if I was offered 6+ months of severance I just couldn't justify staying even in the best companies I've been at.
The assumption that people who get hired after interviewing are "better" than those who are fall off the hiring funnel underpins the entire hiring process that even Square relies on. Does the assumption seem outlandish to you?