Maybe it changed? I know when the smart contracts were finally released, there was a bunch of discussion about only being able to do one transaction per day, or per block, or per wallet per day, or per wallet per block per day or something ridiculously small like that.
It doesn't matter if it's one transaction per day, or one transaction per block per wallet per day or whatever they eventually got it to. That is way, way too slow.
(I could be wrong about this. I pulled the ripcord on cardano when I started seeing the extremely bizarre youtube livestreams about vaccines, and the bizzare, 5 hour word salad interview with lex friedman.)