Technically FTM is still TPMS. There are two variationsl Direct TPMS and Indirect. Direct TPMS is the variation that uses an actual sensor in each wheel. Once the tire starts moving it triggers the sensor to send the signal reading to the BCM. In drect relies on ABS wheel speed sensors, when the bcm notices a difference in wheel speed, it will trip a low tire pressure code. Its not very accurate because IIRC there needs to be almost 15psi difference in a tire pressure before the car will detect a low tire.
The problem with direct tpms is obviously cost, the sensors are prone to failure, batteries die in them, corrision eats away, they leak 10x more than traditional valve stems etc. Im sure the reason why BMW went back was due to cost. It costs them too much in the end, switching back to indirect involves no extra equipment, and i guess they figure at the end of the day if the customer sees "check tire pressure" theyre going to drive it to a shop/dealer because 95% either A. do not own a tire pressure gauge B. have zero idea what their tire pressure should be or C. they just dont want to deal with it.
2003 E55 AMG - Obsidian Black/Black, Eurocharged ECU reflash, 84mm SC pulley, CM30 IC Pump, FTP Heat exchanger, Needswings Dual CAI, Custom exhaust, Forgestar F14's, Lowering links, E63 Spoiler, CF Front lip
2000 BMW M5 - Alpine White/Silverstone Extended Leather/BBS LMs 245.35.19, 285.30.19/Evolve Alpha-N/Tubi Exhaust/AA Intake/Ducts/Dinan Springs - RIP
2001 Yamaha R6 - Yamaha Blue, Yamaha GYT-R Exhaust, Factory Pro +4 Ignition Advance, Factory Pro Jet kit, 03R6 Airbox/Filter, Clear Alternates and fender eliminator, puig windscreen, Yamaha Solo seat, APE CCT
2000 Durango SLT+ - 5.9 V8, 3.92 LSD, 32x11.5 BFG All Terrains, Airaid intake, Hughes F1 Airgap, SCT Tuner, Flowmaster 50 Series, Fully rebuilt 46RE, 2" torsion lift
Glock17 9x19|Vz.58 7.62x39|Mossberg 500