What concerns me about mass wfh is that most people don't have the appropriate set up.
I've just started a new job and a DSE assessment was part of my induction pack. Like @KimberleyClark I was trained in this in my first career and spent hours banging my head against a wall over proper office chairs etc in a previous post.
IME a laptop on its own isn't enough; it needs to be on a riser with a proper keyboard and mouse. Typing on a laptop keyboard at the rates required in my work would give me MUSC issues in less than a week!!
My current work laptop lives at the back of the desk, lid down, and via KVM switch it shares a keyboard and large screen with my home PC.
I have a proper desk, adjustable chair with arms etc and plenty of space.
Very lucky though in that our kids are grown/flown and, with two of us rattling around in 4 bed house, we've both got properly equipped study/office set ups.