Idk why you say so. It doesn't take much searching to find receipts for people showing 3-4Gbps. But "realistic" is gonna be very hardware/firmware dependent, proximity to router, etc.

Examples

2 yrs ago hitting 3.9Gbps https://www.reddit.com/r/HomeNetworking/comments/13ipl7n/tp_...

https://www.reddit.com/r/linux4noobs/comments/1hal8bm/intel_... "I have a BE200 in use on KDE neon. Kernel is compiled with the usual wifi7 modules. I hit 4Gbit/s on an MLO network."

https://www.reddit.com/r/telus/comments/1b3xrlf/wifi_7_speed... "WiFi 7 can reach WiFi speeds up to 4 Gbps on my phone"