Sorry, got distracted with another project. So I am guessing that when esp_wifi_set_mode(WIFI_MODE_APSTA) has been selected, then esp_wifi_set_config() is used separately on each interface, once with WIFI_IF_STA and once with WIFI_IF_AP.

Why would one not just always select WIFI_MODE_APSTA and ...

Will there be a sample using WIFI_MODE_APSTA?