Like maybe a week ago there was an article on HN arguing that true blended remote/onsite is impossible. That at least some of your office co-workers won't be inclusive to remote workers (e.g. refuse to use slack).
It's all about forcing in-person workers to use the same communication tools as remote workers - which is worse for those particular interactions, but better for the company overall.
I work remotely & onsite. This is a problem.