So why has Apple left Intel users out?
The short answer is that those machines aren’t up to the task.
FaceTime Portrait Mode
Most of the M1-only features in macOS Monterey rely on custom Apple Silicon hardware.

Apple
It’s like asking why a black and white television set can’t be updated to show color movies.
Maps
One area where Apple did adopt the brute-force approach is in Maps.
Object Capture
Object capture is pretty wild.

Apple
It’s kind of like a 3D panorama.
You’ll need third-party software likePhotoCatchto use it, but the results are impressive.
Object Capture requires an M1 Macoran Intel Mac with at least 16GB RAM and 4GB VRAM.

[Emphasis added.]
Previously you were limited to just a minute of chit-chat before your Mac cut you off.
This all takes place on the gadget, which is great for privacy, but also for speed.

Apple
The speech-to-text transition should happen faster and more reliably.
If youre still using a new Intel Mac, this is probably annoying.
And this is just the first wave.