For me the biggest problem is that OpenWrt does not work in STA/AP mode with my box - LiveBox 6 used by millions of users of the Orange network
For SFR boxes, Bouyghes, ... it's the same
And that we do not say that their firmware is bad and does not comply with standards or security
These access providers also have boxes in PRO version
With OEM firmwares STA/AP mode works