Exactly what the last 2 posters said. We have to do what we have to do. And that means limiting social contact (meeting one person outside if necessary, not having 2 people over to sit in the garden), and going to work. We need to get work moving before we can resume our social lives. Of course we'd all rather be in the company of friends/family than colleagues, but that's not how it is right now.
The point about seeing 1 person is that you can only pass the virus on to 1 other person. If you see 2, then you double your transmission.
Act as if you have the virus - do what has to be done (going to work, supermarket shopping), and limit your contact with others outside of that. Following this will mean we bring R down more successfully and can then start doing the things we WANT to do.
The rule about seeing 1 other person doesn't mean you HAVE to go out and meet people, but provides some much needed respite for those who have been on their own for 7-8 weeks, or those who need contact outside their home for other reasons. I'm desperate to see my friends (my parents are shielding, so no hope of seeing them for ages), but I understand that actually we don't NEED to see each other just yet.
The same applies to wearing masks - we need to think about why they are being worn, and the wider implications of doing so. And many, many people don't.