personally I was looking at replacing laptop wifi cards with BE200s and a new wifi 7 router to get at least 2Gbps for local network file shares sans cables. People also seem to get 4Gbps with MLO enabled. but the 6GHz routers are very expensive right now
To saturate 2.5Gbps in a single direction with WiFi 6/7 modulations with 2x2 MIMO (most phones, tables, laptops have 2 antennas), you need a (total) channel width of 200MHz, and that's for devices in the same room as the AP. If you want to saturate it with devices in the next room, you need closer to 240-300MHz, for example: using say you use MLO with 160MHz on 6GHz, 80MHz on 5GHz and 20MHz on 2.4GHz), totaling 260MHz.
I tested out with U7 Pro Max (MLO enabled on EA firmware) and QC WiFi7 card and it topped out at about 800-900Mbps within the same room. Impressive for WiFi still, but reading the WiFi speed numbers on the box and expecting them to actually be achievable wasn't realistic for a decade now.
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.
