You don’t have to test. You can just live with the product as is. The involvement here is purely optional.
I would argue that nothing was broken by any release. In fact, the backend for search results did not change between 1.7 and 1.8.
The search bar autocomplete feature was changed in the last build, but that’s the nature of a subscription service. The software will change over time. This is not something we plan to change.
However, what did change is that we eliminated the old poor matching autocomplete. It was eliminated because it was bad. The majority of feedback on the new autocomplete has been positive. These forums and your anecdotal experiences are valid, but they do not have a monopoly on the product design.