Not enough is made of why it is as it is, though.
The principle of how most countries are doing it is that you assess the effect on R etc of a raft of different unrelated measures. Then you "a la carte" pick the ones to add up to the desired reduction in R with minimal economic damage.
If people understood that, the inconsistency is no longer an issue.
So the answer to "why can I meet my family down the pub but not at home" is quite simply twofold - one, that the economy needs to be kept going (because if it collapses, people die too), and two, that COVID secure measures can be enforced there but not realistically in your house - you simply aren't going to hug people in a pub, for instance, as things stand.
It's quite a nuanced point that is different from most other things, yet almost nobody is actually explaining it. When I make that point on FB posts saying things like that question, the answer is usually "Ah, that makes sense".
But Bozza and Hancock like treating the public like they are thick. The Cummings saga proved that (and was a turning point on compliance). He still needs to be sacked in disgrace.