I have to say that I’m not actually all that keen on working from home, or at least it being an expectation. If there’s an *expectation* that people have to work from home, it disturbs the sanctity of staying home and resting so that you can get well again. I can see even tax benefits leading to companies putting pressure on employees to do so.

Good point. I personally think that a sick day should be a sick day. If you have to take it out of sick time, you shouldn't be expected to do any work that day. Working from home while somewhat sick should be a regular day of work that's paid normally and doesn't affect your leave balance.