1. White-boarding new systems/features. I find value in having the team in the same conference room and being able to use an actual whiteboard. So far, I haven't found a virtual whiteboard that was anywhere near as usable. I don't mean for pseudo-coding, but quickly sketching UIs or system architectures, where coworkers can walk up and edit each others work in real-time.

2. Onboarding new employees. Both for "water-cooler" socialization and ease of having the new team-member access other team member for whatever questions they have (Slack and other tools are most of the way there for the latter, but there's still something to be said for reading facial expressions and getting a "feel" for somebody).

And I freely admit some of that may just be my own biases. I've hired remotely and locally, both successfully, and with my company spread across 3+ continents, I'm used to remote collaboration.

I've worked with remote team-members for 20 years now. The tools today are light-years better. Heck, when I started at this company, many of the remote employees didn't even have stable internet connections - that was "fun".