So just like reddit 14 years ago when I first left Digg for greener pastures. When I joined, it was years before my local city subreddit sprang to life, and for years, it had around 1000 active accounts and only now has over 10k accounts.
Man, if the people on reddit back in the day had sat around complaining about lack of content like this, the site would have died. Instead they started making fucking content.
It takes time for communities to grow, and it feels like a lot of the folks who left reddit only ever knew reddit as a ready-made-community filled with thousands of people already. As in, they were latecomers and missed all the slow growth.