Are people thinking that people who are overweight/obese, but have no medical conditions to make them extremely vulnerable, will be advised to shield? I simply don't think that is or will be the case at all.
Personally I imagine shielding will be recommended on age ie perhaps over 70, and underlying medical conditions as before but with tweaks (eg a lot of DC removed, immune suppressants removed and T1 diabetes added - and that's just examples off the top of my head, I don't have enough medical knowledge about it obviously) but not solely on weight alone!
I seriously doubt that overweight/obese but otherwise "healthy" people will be advised to shield and I very seriously indeed doubt that there would be any employment/income protection for people falling into this group.
And at the risk of sounding like a Daily Mail reader myself, I was advised to shield due to a lung condition (among others) and it's shit. I can't unfuck my lungs to reduce my risk sadly, but I could lose weight if that was the only factor making me CEV.
As usual it's probably the well worn government tactic of divide and conquer, just applied to shielding - eg "my taxes aren't paying for Janet to stay at home because she's overweight froth froth froth" rather than "why aren't the government protecting people who are medically at the highest risk?"
(See also "why is my neighbour contributing to the test shortage when her DC clearly just has a cold?" Instead of "why the fuck we do not have a proper testing strategy and capacity?")
Look sideways, not up - I think that's the governments main strategy, and also their most successful...