Also, Mozilla will reimburse space in the form of a coworking lease in the worker's city. (Edit: Who knows if this will continue after Coronavirus) I don't think there's any kind of benefit for the costs incurred by the increased use of home space, but I do think there should be.
Mozilla did an ergonomic inspection on my workspace at my request when I still worked in an office. I haven't had one on my home office, but I do agree that companies should pay for ergonomic assessments of home offices.
I do agree that as more traditional companies switch over, they may not be so generous with their reimbursement since one of the biggest benefits for them is cost reduction. They can silently move all the costs of working space onto employees. And I do think this will result in people seeking larger living spaces in general as well, unfortunately for energy efficiency.
