Yes, I feel confident saying by and large they are. I've noticed a massive drop of collaboration with our switch to remote during this time. Sure there will be exceptions, mostly from in person companies being very bad about it, but there are fundamental limits with remote that don't exist in person for collaboration.

Depending on how the rest of the team prefers to work, they can be, in the same way that two in-person workers at a predominantly remote company could be less collaborative if they do most of their conversing/deciding in person instead of on Slack/Chat/Email/etc