Google is constantly updating Google Analytics and while most are great incremental updates or game changing announcements like GA4; some are not as warmly received. Take the deprecation announcement in 2017 of the in-page analytics report (previously the Site Overlay report). This trusty report would show you click and conversion data overlayed against the actual pages of your site served in the GA interface. Due to ever-changing browser security issues, this report just didn’t work properly and Google created the Page Analytics Extension for Chrome. That said, this extension also does not always work, and it was also deprecated later in 2017. (The extension is still available, just not supported or improved.)
Recently, you may have received an email about connecting your new GA4 Property to your Universal Analytics Property.