Kamika242 you already need to give your ID to google for app publishing in play store, no? Not much has changed outside of not being able to load apks directly from the FS.
Its not a good change unless google makes it a dev toggle to enable, but the idea much has changed in regards to app publishing isn't true. Just how end users have to install it.
As far as I understand, you do not need a custom ROM to install apps from unverified sources, just that android has provisioned ADB as the main method of doing so. Not good but also isn't a complete system lockdown.
https://support.google.com/googleplay/android-developer/answer/13628312?hl=en