I think part of the issue is that we don't know what the longer term future looks like. People will respond to what they think is just around the corner and every small change will bring a new wave of anxiety and differences of opinion.
In a few months, we will all have become used to a normal that is new to some extent. We may end up with a successful vaccination programme, or not. We may never start shaking hands again. We may make changes to education. Whatever it is, we will soon get used to it and the anxiety will drop.
If, in the meantime, people need to make plans that they feel will keep their families safer, that's OK. I don't imagine many will still be choosing to shield without good reason by this time next year.
FWIW, my whole family can either work or be educated from home for the foreseeable future so that's what we plan to do. I know someone fit and healthy of my own age who has died despite huge efforts by the NHS to save them and I'd like to reduce the chances of that happening to me, even though I know they are small in the first place.
That doesn't mean I'm enjoying lockdown too much or over reacting. I'm just using the information available to me to make the decisions I think are best for my family right now.
Things will change around me and more information will become available and I might make some different decisions in the future.
It's OK for some people to enjoy lockdown and it's OK for some people to decide to isolate a bit more than they have to.