Yuk! So does that mean there will no longer be any Combo Installers that I can download and apply myself? That's not good.
That's how I read it.
And "rerunning the Combo" is no longer an option. We've now got to reinstall the entire OS.
Not good. I insist on being in complete control with either installing or updating the Mac OS, and with most of my applications that I use. Not having that option with updates anymore in Big Sur is a real bummer.
I'm not sure what control you've lost.
You can still install when you're good and ready, and the source is still Apple. albeit via a different d/l channel.
The only thing you've lost is the ability to save the d/l for later, and rerunning it has been chancy for years, anyhow.