Is your idea related to a problem? Please describe.
Currently TinkersConstruct book is tagged as "forge:books"

Describe the solution you'd like
It'd be better if it is tagged as "forge:lectern_books" so that it aligns with other guide books from other mods

You are thinking minecraft:lectern_booms, and that's not what that tag is for. That tag makes a book work with the lectern. Many non-guidebooks have that tag. ThAt is why we tag our books forge:books/guide, so only guidebooks are there. I'd advise other guidebook mods to do the same.

I'll probably tag our books for the lectern eventually if I can get the UI working properly, but that tag is not assigned arbitrarily