Finsweet Attributes: using Combine, Filter, Nest, and Select together (UPDATE: this no longer works 💔)

Created this to test the current possibilities and limitations of Finsweet's Attributes system (which, 💜, incidentally). For my use case, I really needed to combine multiple collections and filter by field data from multiple multi-reference fields in each collection. I also used Select to add filter options to select fields. It works, natively! No custom JS needed. (My main takeaway for me was to TRIPLE check all my attributes for misspellings, I have a bad habit of fat-fingering, and 1 misspelling could break it all.) Thanks a million, Finsweet! 🙏 UPDATE: this no longer works 💔