@Gallatin 21V Thanks for reaching out. I have reached out to my team and will keep you posted.
Update 3/15:
I have got an update from the team that in China, TLS 1.0 and 1.1 are not supported for Event Grid. For public cloud they are supported and that’s why there is an option to restrict them. As TLS 1.2 is only supported in China Azure event grid that is the reason there is no option of restricting it.
Once the product team adds support for TLS 1.3, having that minimum TLS version everywhere will make sense to have the option of restricting the TLS 1.2 and 1.3 for China region.
Let me know if you have any queries or concerns.
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