I don’t see an issue with marking past topics as solved, if you happen to pass them by. But I’m certainly not going to go over all of the past topics
When searching, you can put
in:unsolved to only show solved/unsolved topics.
You can also append
?solved=yes to a topic list URL to filter the view. For example,
https://meta.discourse.org/latest?solved=yes will filter the homepage to only show filtered topics.
https://meta.discourse.org/c/support?solved=yes will show solved topics in the #support category.
There are talks about adding this to the UI more prominently, but it doesn’t exist currently.