If LSD appears to offer such a huge benefit to scientists, why aren't there intellectual haven countries that allow it (this would give them a huge STEM advantage over others, wouldn't it?)?
1) Drug enhanced STEM advancement doesn't seem to have caught on that much with far less controversial substances. It's a little taboo.
2) I'm not convinced that psychedelics do offer all these amazing benefits, I think a lot of it is wishful thinking. (Though this is where further research would be helpful).
3) There are all sorts of political reasons why a switch-around on policy isn't going to happen overnight. Large sections the public are still sold on drugs as the scourge of society, and politicians are still making bank on talking that up. There are also a variety of international treaties that make changing these laws more tricky (IIRC).
Tobacco and alcohol companies have lobbies that help keep MJ, LSD, and magic mushrooms illegal. I am pretty sure all three are less physically addictive and detrimental than tobacco and alcohol, but it might be a very long time before we find out definitively because research is blocked by these lobbies.
And why aren't intellectuals flocking there?