I nearly always use Tailwind, had no idea there was even a Plus offering. Checking the site I see it now but it’s a subtle link. Also wonder if shad/cn had something to do with the reduced usage of plus.
As said is it is to say shadcn is what Tailwind should've created and maintained for a fee rather than some html/css templates that are easily replicated.
I say this as someone who bought Tailwind+ to support the project many years ago and still use Tailwind every single day.