Its code base not kept up with current best practices. I consider it a prerequisite for any new use/deployment of the extension, for it to first have an active steward, be updated to current best practices, and specifically to have a significantly better startup performance footprint for regular page views.
Its currently structured in a way that requires each tour to be registered as its own top-level module bundle, which does not scale (incompatible with current guidelines).
Some ideas: