With the exception of the "extended" qualifier, I believe the answer is yes. I have extensive experience growing remote engineering teams. As somebody else here mentioned, extended offsites are difficult because schedules are tough to coordinate, people have families, etc. However, it is very common for remote teams to have anywhere from 1-4 offsite meetups per year - anywhere from 3-7 days in length - where a combination of work and play occur. The more the better, but the frequency and length tends to be dictated by budget. These are great opportunities to build culture and rally around big projects. As more companies go remote, I suspect they'll find the same types of offsites and cadences making sense for them.