For the use case of this plugin, to provide a simple lightbox, I see baguetteBox.js as feature complete. Actually, there is some development happening over at baguetteBox.js, see https://github.com/feimosi/baguetteBox.js/commits/dev/
As I developed and still use this plugin on my websites, I will maintain it and even add support for more third-party blocks if it’s possible and requested.
The plugin could go obsolete if the WordPress Core lightbox gets better, but I think this will take a few more years.
That last sentence captured my attention. WordPress doesn’t have a lightbox does it? If so, I’d like to try that.
WordPress offers a native Lightbox for the Image Block. You have to activate it on the link to dialog for each image.
You can do this for Image Blocks inside a Gallery Block too, but you can’t navigate between the images of a lightbox inside a Gallery. There is an open PR for this issue: https://github.com/WordPress/gutenberg/pull/62906
Cheers, I’ll keep an eye out.