Work from home entirely isn't effective, but some organizations that lived & breathe technology & digital eco-system could work out effectively on an alternative and simultaneously could work long-term strategies and prepare for the post COVID environment. Hence, it is productive for them.
Some other organizations from several industries such as manufacturing, an automobile, etc which don't have the option of surviving through WFH. To them, It hit the most. But, for them the silver lining has been working on the strategical part.