I always find Confluence to be the place where docs go to die. There's very little motivation to keep it up to date and tends to be one or two people driving it. When they move to another team or job, then it gets abandoned.

The things my team uses GitHub pages for tends to do better because devs don't object too heavily to writing code comments (for generated docs), markdown (for design docs), or API specs (for API docs). The last two in particular have become a big part of the design process, so it's been bought into heavily. Whether those stand the test of time remains to be seen - they're relatively new.