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We have two separate arguments here. One is that cars are too complex and that we don't need this level of complexity to make a perfectly good car. The other is that manufacturers are trying to protect their service networks by going out of their way to make sure that only theor own agents can understand the car.
My frustration is not so much about the change in technology but the change in attitude! (by the makers)
In the past I had a series 2 XJ12, the owners handbook (the one that goes in the glovebox! NOT the "workshop manual") contained
in great detail all the routine servicing procedures, including pictures of grease nipple locations and so on. This was clearly not for the owners benefit, (at least not the first one anyway)
it was for the benefit of any garage that the owner had taken his car to for servicing.I also had a Rover P6 TC. setting The camshaft timing (as with modern vehicles) required the use of special tools. However (unlike modern vehicles) the special tools
were included in the standard toolkit that came with the car! Again, this was unlikly to be for the owners benefit but rather for the benefit of any workshop that the car might be taken in to for, say, a blown head gasket!
(the Rover also had features that showed that the designers had considererd access issues for maintenance and had made
Specific provision to make access easier (the front crossmember had two little cut outs in it to provide access to the front sump retaining bolts, as I have said before, on a modern vehicle more offten than not you will find an otherewise clear access blocked by a plate welded accross that seems to serve no other purpose han to force you to remove the engine!

)
(The bodywork design on the P6 was "Unique" and was also designed with ease of low cost repair after minor accidents very much in mind. (You could replace a dented wing in less than 30 minuits! Fully painted the lot!!) I might describe in more detail later)
The main gripe is that the new technology has been used not just to meet various emissions standards (which IMO are getting silly, and have been for some time. The BIG imptovements were all achieved by the early 90's we are well past "deminishing returns" limits by now) it has also been exploited to controll the life cycle of the vehicles in a way that never existed before.
Most of my vehicles are over 20 years old, The "Young" ones I inherited last year when my Dad died. The "Youngest" is an R reg Jag. It is a lovely, comfortable luxury car. (Sadly it is also a bit tatty, my dad was prone to scraping bollards unfortunatly) And it is being slowly killed by the electronics! I have no doubt that The engine and transmission could run till doomsday, but the electronics are progressivly dying. I have had to pull the fuse from the electric windows because the computer that controlls them has gone mad! The stupid interlock thing that stops you from moving the gearbox out of park unless the ignition is on has died (fortunatly I was able to "work round" that one) The ESP warning lights come on at first start (but go out later )
and so on!
Now, I might well be tempted to spend the £500-1000 (or whatever) that it would take to deal with all these bugs because it is a nice car and will be unlikly to be replaced, but I wont because I could get all these fixed only to find that some other piece of expensive techycrap goes wrong in 3 months time. This should not be confused with mechanical repais on old cars! when you fix those you KNOW they are fixed. With old electronics it is an expensive lottery.
I doubt if many 2008 cars will still be running in 2028 Assuming that a) suitable fuel is still available and b) Governments havent brought in "Anti-old-car" legislation

my, already old ,old cars will likly
Still be running!
The one that has the best chance of doing so (since you mentioned it

) is the SII Land Rover!(which will be 60 in 2028!) The next most likly is my 1984 VW transporter (by which time it should be up to 450,000) and after that the 94 LandBruiser
(Spares avalability is likly to be the biggest issue, I believe Toyota will manitain spares availability for the landcruiser range, but I recognise that the landcruiser, despite its lack of excessive electronicrap, is likly to be the most vulnerable to manufacturers planned obcelessance

The VW will probabally have "Important" parts available indefinatly and as for the Landrover....

)