Actually this is not a SEC vs other regulatory bodies in the world. While nuance is different across jurisdictions, the underlying principles are generally the same (atleast in Western jurisdictions).
The SEC actually has a fairly consistent approach and has been putting out well thought out guidance on these matters. It just so happens that the crypto community has not been paying the required attention to detail.
Regardless I will restate here that the above explanation on UMA synths will stand across jurisdictions. UMA tokens by themselves are a governance token and hence have a potential to be seen as a security (if their performance is largely dependent on a core team).
So from that perspective decentralization is important.
However it is also important to not mistake decentralization to simply having more community discussions or a wider user base. There is more to this matter but it will lead to a digression from the point at hand, so I will close here.