It depends what you’re using it for. If you aren’t using it to track your sports activity, it is not that useful. Maybe the notifications are useful. I really enjoy tracking my steps and knowing if I should be more active. I use gadgetbridge, so that my data stays on my phone.
And it will not get upgraded to 20.04, it will stay on 16.04. My biggest issue was that I could not do much with it. It was only a bit better than a dumbphone. Without apps, every mobile OS dies and back in the day I could not even get Signal working. It was a pain to set up webdav for contacts sync and when I gave up and wanted to use my own nextcloud, it refused to work because of my https cert…