It's just business: Apple won't intentionally remove features that makes their hardware more attractive. It's where they make most of their money.
Second while Gatekeeper has been around for 8+ years, the default of contacting an Apple server on every program launch was new (or so I thought) with Big Sur. It's a step towards that direction. People could not launch apps when this server was down.
It only became noticeable because there was an oversight in the "fail-fast" algorithm. If Apple was available, it was assumed it would be fast, and it wasn't when there was an iCloud outage.
Federighi quote: “We have the core technologies for them to do that, to run their ARM version of Windows, which in turn of course supports x86 user mode applications. But that’s a decision Microsoft has to make, to bring to license that technology for users to run on these Macs. But the Macs are certainly very capable of it.”
To be completely clear, this quote may have only been referring to virtualized operation, but given a change in the WinARM solution licensing model, Apple might support booting as they did on x86 Macs.