>I personally prefer a company where everyone's on site. I want to be able to quickly resolve any issues in person, not over voice call or slack, and I think that an environment where someone can tap me on the shoulder when they need help leads to overall higher productivity, even if individual productivity suffers temporarily.

I found that actually opposite was true in my case. Less distractions ,less interruptions and we cleared A LOT of our backlog. It turns out a lot of those "urgent taps" turned to be not so urgent, or other person being just lazy(it was faster to walk 1min than to do a 5min read on our internal docs, or just google it)