You would be missing out on:
- Minimum Target SDK Enforcement Blocks installation of apps that target ancient versions of Android and legacy APIs.
- Restricted settings for sideloaded apps
- Null-Cipher rejection and 2G disabling
- Cell Network Surveillence Alerts
- Platform Rust Migration
- Scoped Media
Among many many unpatched Med and Low severity CVEs that don't get backported.
Funny to list a user-hostile change as the first “improvement” that comes to mind.
I guess GP should have said “series of cosmetic changes, and breaks in your UI habbits and a few of your apps deemed too old”.
Feel free to look at the AOSP SDK changes for each major version that's released and you will see many of these examples.
Apps that failed to keep up with these changes, regardless of licensing, should be avoided and ultimately removed from availability.
The deprecation of 32-bit apps is another example of this.