Bosch FW 200 Boiler Control

Chester

I'm having my Bosch Greenstar 57 installed soon and am still on the fence about whether to attach the included FW200 control to the boiler or use the wall mount option and use it as my thermostat as well. My installer is a Bosch ABC-certified outfit but has never used the FW200 in a wall mount application. Reading the literature it looks like if it's wall mounted it does all the same functions but also provides indoor feedback to supplement the outdoor reset:

"When the FW200 is wall mounted as a room sensor, it uses room temperature to adjust the heating curve and modify boiler supply temperature accordingly."

Any recommendations? Any reason not to use it wall mounted other than aesthetics?