There is a valid discussion to be had as to whether UX or data privacy should be prioritized, but I'm inclined towards UX--most people just want to get the best search results possible.

If anything, on the UX <--> privacy scale, I'd argue Apple has sometimes been prioritizing privacy too highly as of late. As a heavy user of custom Applescripts, the new TCC dialogs introduced in Mojave have been causing me a lot of grief.