The "if you can" is the problem. Lots of people are making out they "can" work from home, but can they really do everything or is it just them doing what they can and leaving other things not done?
At work i'm usually in contact with numerous organisations on a daily basis. I'm experiencing real problems in contacting people, delays in dealing with things, etc., that impacts on my work. In my personal life, it has become almost impossible to contact banks, utility firms, telecoms, sky, virgin, BT, etc - they've taken down live chat, and I can be waiting in phone queues for hours, only to end up speaking to someone who can't help and can't pass me to a colleague (because they're at home!).
Firms who usually take on trainees (such as accountancy/audit practices) haven't taken them on this Autumn, because they can't train them, as training is usually "on the job" in their own, or client's offices.
I'm sure a lot of people can work just as well from home, but my experience is a lot of what should happen, isn't happening. Whether that is the fault of the employer, or employee, I don't know. But sooner or later, such difficulties need to be addressed and rectified. For a few months, lower efficiency, delays, etc is tolerable, but not in the longer term.