Google continues to stress that sideloading isn’t going away. Power users will still be able to install apps from any source they choose. The difference is that unregistered apps will require extra steps, while apps from verified developers should continue to install normally.
https://www.androidauthority.com/android-sideloading-changes-timeline-3679204/
I don’t know why people downvoting your for saying what’s actually happening.
Still a dumb decision that they’re changing it though.
Give them an inch, they’ll take a mile!