I'd say it's more due to the proximity of your VHF transmitter to your FM antenna, and the overall lower quality of FM receiver front ends today.
On my old 2005 Elantra, the factory radio was excellent at receive sensitivity and did not care about the Larsen NMO 2/70 and a 50 watt 2 meter signal 2 feet away.
When I replaced it with a JVC (then Kenwood) aftermarket radio, both would suffer severe desense when I keyed up on 2 meters. The Kenwood had HD, and the HD would always drop out when I keyed up the VHF side of my dual band, and analog signals would become weak or become total static. Same antennas and same feedlines.
I have yet to install a transceiver in my new 2013, but I am concerned as all the on board electronics, TPMS (which uses 430MHz transponders on each wheel), navigation system- and more importantly, the AM/FM antenna is actually in the rear windshield. It also has an active antenna amplifier, and the last thing I want to do is blow it out with excessive RF.
today's consumer cars are not very "radio" friendly places.
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