I think pairing may work for some circumstances but not for longer-term issues, like a health issue or if you have to take a couple of weeks to stay home with a child or with an elderly parent. The coordination alone is difficult.
All of us have to do trades for when we are away from committee, or if we have to go away for a conference or so forth. It's difficult enough just to find somebody to substitute your spot, never mind trying to coordinate it in the longer term. That is where going hybrid or having hybrid provides the flexibility.