Not to mention the fucking insulting assumption that people were not already working hard. During my tour (left years ago) there have been many time periods when I worked my ass off. I ended up leaving because of the total burn-out and the effect it started to have on my health. Despite that even years later I played with the idea of going back someday. No chance of that now of course. So sad to see it end this way.
Put yourself into their shoes. Why take a risk with Twitter when there are other options with similar returns but without the drama? There is a non-zero chance that just being associated with Twitter could turn out to be problematic in the coming months.
One thing is for sure: It will be absolute hell for those who will have to keep things running in the coming months. For better or worse Twitter infra is extremely comlex. 50% gone would be very rough even if the cuts were made thoughtfully and things were in KTLO-only mode. But that's not the case. Musk has already been pushing changes through skipping the normal process and will likely continue doing so, aggressively. Not a good combination.