Bitcoin's script language is very restricted, claiming that Bitcoin has been doing "smart contracts" is disingenuous to me. I wouldn't call a bitcoin script as "smart". Ethereum was born because of this
> Smart contracts were first proposed in the early 1990s by Nick Szabo, who coined the term, using it to refer to "a set of promises, specified in digital form, including protocols within which the parties perform on these promises".
https://en.wikipedia.org/wiki/Smart_contract
We don't get to decide what smart contracts are. Nick Szabo decided long ago.
Marketing vs reality has been a big problem in this space.