What is interesting is that they paint this as a security reason:

However, Microsoft has decided to remove this option from the Edge settings menu, citing security and privacy reasons. According to a Microsoft engineer, the reset sync option was “a potential attack vector for malicious actors to wipe out user data without their consent or knowledge”.

This is a very common reappearing thing in big tech. They deny you control over your data and device for alleged security reasons. Apple uses the same pretens for locking down iOS and not allowing the user to install apps of their choice but only what Apple approves.
They are right in a way. They are doing this for security reasons. But not for your security but for theirs, from you. You do not own “your” data and you do not own “your” device. We are heading towards a society where you do not own anything. No matter how much you pay for it.