Google now uses Site Names instead of Title Tags in search results
2022 October 20
The new feature makes it easier for users to know the specific website in the results. This, however, does not work for subdomains.
Source: https://www.searchenginejournal.com/google-site-names/467892/
Google says that title tags are important for SEO ranking
2022 September 30
However, it is not the most critical part of your page, at least compared to your page’s main content.
Source: https://www.searchenginejournal.com/ranking-factors/title-tags-ranking-factor/