<<. I've never seen anywhere near that even with WiFi 6 on 5ghz. >>
Then that 5GHz network is not set up for maximum speed, or there are too many different Routers on it.
There are three things that drive speed on a 802.11ax (Wi-Fi 6 or 6E) network. NONE are directly tied to using 6 GHz band. They are:
Channel width: The width of the data channel selected allows a maximum of around 150 M biits/sec per 20 MHz channel width.
20 can yield UP TO around 150,
40 300
80 600
160 1200
in addition, the number of active Antennas can multiply the above numbers
1 *1 so best case on widest channel is 1200
2 *2 so best case on widest channel is 2400 (MacBook Pro M-series has two antennas, so this is its upper limit
4 *4 so best case on widest channel is 4800
These are the Potential fastest speeds. They can only be achieved when the channel widths are set to Very Wide, there is no interferences from neighbors' Routers, you are VERY close to the Router, with no substantial signal-damping building materials intervening.
In many network neighborhoods, you may find neighbor's Routers on every available 5 GHz channel, limiting the channel width you can give yourself without being clobbered by your neighbors' data. In that case, the use of 6 GHZ, sprawled over a 160 MHz channel all for you, may seem luxurious. But it is NOT inherently different from Wi-Fi 6.
Use Ethernet:
With an add-on device on my old Mac, I run a copper Ethernet connection to my Server and the faster devices on my home Network. it runs at 10 G Bits/sec, way faster than even possible over Wi-Fi. The Mac studio has a built-in 10 G Ethernet-over-copper connection.