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Yep, Citrix changes defaults, which is why I started tracking the changes. Some of the default changes are head scratchers and sometimes Citrix changes the name of a policy setting.

Not just that the defaults change, but that it's controlled/set by the VDA NOT the Site.

To me, that is clearly stated because the settings apply to vda versions if you look at the policy help text. It never says applies to a site or controller version or database version

For instance, if you have a 7.15 site and are upgrading to 1912, and upgrade the VDA fist, your ICA files will now have HDXoverUDP=Preffered, even tho the default of the 7.15 site is Off. This can cause connectivity issues if you are using 4.9 Receiver thru a netscaler and the netscaler had DTLS enabled but session reliability disabled.