See also my thorium myths page https://whatisnuclear.com/thorium-myths.html
If they still don't exist, then surely that suggests it doesn't work, doesn't it?
I'm not an expert though, just interested in the topic. I read up quite a bit on MSR and LFTR a decade ago and concluded that it was really interesting tech that can absolutely work but just never got enough interest for someone to "go big" with it. The wikipedia article[0] has a recent developments section that suggests the tech is quite viable.
[0]: https://en.wikipedia.org/wiki/Liquid_fluoride_thorium_reacto...
Insanity.