But that is still for a limited number of chipsets though right? I would absolutely love to see way more support. I remember awhile back the FreeBSD Foundation putting some serious (on their scale of funds) funds to WiFi.

I can't remember which chipsets support it. But yes, the FreeBSD Foundation has been putting a lot of money into laptop support, including wifi improvements.

Can it actually work at 802.11ac speeds? I recall it maxing out at 22mbps.

I don't know exactly how fast it runs, and it will absolutely depend on your hardware and network, but I've definitely gotten more than that.

I guess it's better now then. To be clear, on linux the very same laptop in the very same location (dual boot) I got proper speed. The issue was entirely in FreeBSD drivers.

Yes, we've definitely had improvements recently. 14.3 was much faster than 14.2 and 15.0 is even faster.