I can only add my own anecdotal data but this is certainly not been the situation at my midsized tech company. We were already starting to transition to a permanent work from home situation well before Covid struck so maybe that had something to do with it, but our metrics in terms of deliverables for our projects have never looked better and the engineering department is certainly a lot happier being able to work comfortably from home and without the drudge of a commute.