I've worked a couple of jobs where I was working remote but the main office was open plan. In these cases, it seemed like the open plan offices really did help communication. Of course I was only there one week out of maybe every 6, and it didn't matter that I didn't get that much regular work done when I was in the office, since I was working from home the rest of the time.

I don't know if there's a reasonable compromise. You could have a team that tries to get everybody into the office one week out of every three and where most people work remote the rest of the time. I don't know how well that would work, and I don't know if it would be worth the trouble, but it seems to me like it would be better than open plan all the time or remote all the time.