The moment I stopped retro game collecting is the moment I took a game to the counter and the guy pulled up ebay on his phone to check the current prices. My guy I could have just bought it on ebay if that was my goal.
This is such a good idea in theory but I don't want my passwords locked to one platform. This goes for practically all password managers. If I want to enter that password in Chrome on Windows, I don't want to painstakingly copy a 16 digit password made from random characters from my iphone's keychain.