6 definitely isn't rare. For example, iPhones started supporting Wi-Fi 6 with the iPhone 11 Pro in 2019.

But isn't that how it always is? Whatever next version is going to be rare until it's not...

You have to start releasing products using it at some point.

Wi-Fi 7 is schedule to be released May 2024, but there have been devices released already supporting it for awhile now via the Draft standard. Just do a search for wifi 7 on Amazon.

The Pixel 8 supports Wi-Fi 7 for what it's worth.

I assume the iPhone 16 in fall 2024 will support Wi-Fi 7.