Why not? Stops being taking the piss and parking like dickheads or parking where they shouldn't be.
With fewer cars moving around, there probably aren’t enough parking spaces in many places. However, not moving your car and not topping up the meter because you’ve been told to stay at home is surely a good defence to an excess charge.
As long as the car is registered to a local address, I think they shouldn’t be issuing any tickets unless blocking access for emergency vehicles.