Retirement isn't supposed to be about "doing nothing". It's about not having to work a job to be able to afford the lifestyle you have, as you reach elderly life. There are huge swaths of retirees who still "do things", and some of those things even bring money in! But the difference is, if one was able to prepare for their retirement, that money isn't needed to put food on the table and keep the lights on.
I know and agree, but in modern western societies there is no real expectation of or preparation for doing anything in retirement, least of all something that benefits society at large. Yes, some people transition and find fulfillment in something there do after retirement, but some also are scared and frustrated because they have tied their identity to their job. In my view, it should be the norm (which comes with corresponding support and encouragement) that people comprehend the last couple of decades of their life as simply an opportunity to follow their passions and support others follow theirs with less economic pressures.