Adding smart contract features, and other "bells and whistles", will make Bitcoin more complex and prone to hacking. Security is obtained when everything is kept simple.
Smart contract with Taproot protocol actually caused a lot of problems for Bitcoin users since early 2023. Developers who want quick rich flow tried to use Smart contract through Taproot and abused Bitcoin blockchain for hyping their projects and scam tokens, useless Inscriptions.
These things are scam but look promising and potential for getting profit in newbies' sortsighted vision. Furthermore, it brings more security holes that can be exploited too.