That's an excellent point. To be fair, I allowed myself to work on this while I was sick only because it was fun. This was a bit like scratching an itch, because I'd had the germ of an idea for a while and wanted to get it out of my head. You're absolutely right that it sets a dangerous precedent: the easier it becomes to do work, the easier it is to demand work of the people doing it. The boundaries need to be firm.
On the other hand, this was also a case where Claude really did help me finish something more quickly than I could have without it. So in thi scase I do think it lowered the number of developer hours per feature.