PLEASE add back the option to update search results as I type. It's fine if you don't want to make it the default, but the let the user decide.
You say, "The telemetry data shows that by turning off the experience of automatically changing search results as you type, users were 28% more successful finding what they need in the search suggestions. By waiting until the users finish their typing and pressing enter, the results were more accurate, the experience felt less distracting and we improved accessibility of the feature."
I say, "Not updating search results as I type makes finding what I want 300% slower than the old way!" I have tested it.
I applaud Microsoft for adding features and making improvements to their software, but some users like me just want my search results to appear as I type. If that slows search down too much, then let me turn off all the other stuff it has to search through like Help topics.
It seems to me that you hamstrung "search as you type" because you wanted the resources to search Help and other things that I rarely need to search.