Google has been busy with 1,653 launches, 9,800 live traffic experiments, 18,015 side-by-side experiments and 130,336 search quality tests. " As you can see, only a small percentage of what Google tries actually goes live, but to launch over 1,600 new changes in search in a single year is massive. In fact, we don’t know exactly how many of the 1,600 changes are user interface changes versus new feature changes versus algorithmic or ranking changes. I doubt Google would share those details. What we do know is that only one percent of searchers were part of the 9,800 live traffic experiments and that while we likely covered many of them, I am sure we missed the majority of those experiments." looks like it's getting harder and harder to keep track of all of these changes. SEMRUSH does a decent job of recording them but there is no real documentation on what the changes are doing now it looks like there's been a lot of movement in the featured snippets area but aside from that we have to rely on blogs and our own tests now to find out what the next Fred update is going to do. I do find it positive that Google said recently their laying off and reducing time of a lot of their search engine evaluators that means they're going to relied more on rankbrain, which means things might get a bit more predictable.