Wifi 5 vs 6, 6E and 7 are worlds different. A LOT has changed in that time.
It was either 6 or 7 that was designed with mesh/extenders in mind, and it actually works really well if you have good hardware.
Also even in the wifi 5 days they made mesh/extenders explicitly with duplex issues in mind. Just about every high end wifi 5 system had at least dual band wifi, with most having 3.