I don't use FM period any more except for the clock radio and when renting cars.
At least with Sirius I get some control over my crappy sounding music.
There are SQ reasons to leave this out as well since you are adding in an RF antenna to a device where HF noise is already an issue.
Well I do listen to radio on the go, specifically news radio because it´s also part of my professional duties, couldn´t care less about listening to music radio
So it´s a must for me, seems again my answer will be the upcoming sony F886, they keep fm radio in and I don´t think noise will be an issue, hx/mx master section of sony´s do avoid noise interference because of that proprietary circuit there´s no ad-da /dac stage
but if fiio had this add in I would buy it