I think most of the fear/attitude towards modern vehicles comes from the aged population that don't even like using the computer they (might) have in their house for general use. So computers "intruding" into their car scares them off from owning or working on one. I am a computer person by trade, so working on a high tech car doesn't really bother me. I am even considering obtaining an actual MB diagnostic system/laptop like the dealer has to work on our cars...would be pretty cool.
In comparing my bro's W210 to his W123, yes it is more complex, but basic maintenance is way easier, and it has been just as reliable if not more reliable than his 300D was....he's crossing 150k with no problems. His 300D had 221k when we got it, and we retired it at 259k. It was reliable but had its share of MAJOR repairs. (suspension, brakes, etc) and just about nothing worked on it other than the defrost button, lights, and drivers window/sunroof.

His W210 is 12+ years old and ALL electronics/accessories work perfectly fine still. It also has nearly 100 more horsepower, and yet gets about 15% greater fuel economy overall, especially highway. The M112 motor is a strong competitor IMHO to the 617 for title of "great engine". Both are excellent, the M112 is far more sophisticated.
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-diesel is not just a fuel, its a way of life-

'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)