I worked in a team that didn't do reviews because _everything_ including spikes, research, etc, was done by two engineers pairing. This was remote, cameras on, all day.
I found it utterly exhausting. I was somehow working at 100% capacity but producing output at 50% because so much of my cognitive bandwidth was taken up with the pairing process.
I've been on full time pairing teams but noticed 2-5x more throughput because there's fewer meetings, code review, and surfing the web. It's exhausting because suddenly I'm actually writing code 7+ hours a day and that's really hard.
Every other team I've been on without pairing, writing code is at most 3 hours a day. The rest of the time just gets chewed up by other communication channels.
I found it utterly exhausting. I was somehow working at 100% capacity but producing output at 50% because so much of my cognitive bandwidth was taken up with the pairing process.