Zanary, no offense but not everyone can just stream from radio.com. I live in a very good cell area, wealthy suburban area, yet the cell service drops off completely in many areas. Or it stops streaming for a few seconds and then resumes. This is very annoying, hence why I use FM radio (could care less about AM or Sirius). Also my wife and kids always put on their favorite local FM stations when in my car. The big issue is unless you have great cell signal, you will get drop offs, no service, ect. , and even in good cell areas ATT is giving you lower priority (do a speed test) then the same ATT phone in your hand on 4G, a lot lower. That is why the browser takes 1/2 an hour to load a webpage even after a reboot on cell, and why having live traffic, streaming radio, browser at the same time is impossible, just not enough bandwith and priority. Sure MCU2 is faster at rendering webpages, but it is not faster at streaming or getting the data for browsing from the cell towers. The Nvidia Tegra in MCU1 is way more than fast enough to render a website, hell it could play 3D video games, the problem is a few things (not enough ram, poor coding, poor LTE cell reception/bandwith). So unless MCU2 has a better cell receiver/transmitter and better antannae and higher priority to ATT towers, it will be no faster than MCU1 at streaming audio, and it will get the same pauses and drop outs.
And if you are going to do a job, an upgrade, do it right or don't do it at all. No reason to lose FM radio due to laziness or a few extra dollars.