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@profra
If you are considering a new board with ESP8266 controlled by another MCU please take into consideration the serving of pin CH_PD by one output pin of the master MCU. In many situations we don't need to power on ESP8266 in the same time as master MCU (battery life), it means that on the PCB could be any jumper with two positions:
I am using this arrangement and it is very helpful when you are running on battery. BTW the pin CH_PD can be used as RESET too, it means you can save output pin of master MCU for the pin RST of ESP8266.
Note: if you plan to connect GPIO2 to the master CPU please connect it with pin which could be RX... it would be useful for "cathing" of debug output from TX UART1.