I have had a play with v4 and it really is not ready for everyday use. Specifically search doesn’t work: I searched for a specific app ‘playmoregolf’ which I know is in the Play Store and which v3 finds no problem. v4 displayed many pages of apps including some which had no relation to the search string but "did not* include the app I was looking for.
I tried a few more searches and the results appeared to be almost but not quite random.
I think we’ll be using v3 for quite a long time unfortunately