You
What format survives a decade of neglect?
ChatGPT
Plain text and HTML with no build step, images in formats older than the archive itself. The test is not whether it opens today but whether it opens with no software you have to install first.
You
How do I know when it stops being worth it?
ChatGPT
When you stop noticing it. If it has not surfaced a problem in six months, it is either solved or it was never the bottleneck you thought.