I was not aware the share codes last that long now, the last time I used one (for work, although this was several years ago) it was only valid for 4 days and my employer refused to accept it which was a whole thing. I was under the (incorrect) impression that the system for border clearance would be worse than that. So I have changed my mind on this point despite your flippant comment, which was argumentative for no reason.

On the case of trusting the UK government to manage the immigration status digitally for people I still have my doubts. They don’t have the best track record.

I have my own UK passport now so I am a bit out of the loop but any sort of system where a person doesn’t have offline proof of their status that they can keep seems like it is open to issues (although physical only also has its issues so there are pros and cons no matter how you approach it).