I'm not necessarily saying discard them all, just rationalising things, for example, items like the thermostat and fuel filter do not need to be buried in a plastic housing with the seal/gasket and sensor(s?) all embedded within and the unit then mounted in the most inacessable position that requires dismantling half the engine. Son in law had a leaking header tank on his Vauxhall, dealer quoted £500 to supply and fit, luckily it was still under warranty.
If a thermostat seal/gasket fails then it should be possible to change that seal/gasket without replacing the thermostat and sensor that probably have nothing wrong with them, it's just a way of maximising manufacturers (and dealers) profits at the users expense.
As for other limits, 2 litre engine capacity is more than enough for todays motoring, we are supposed to be trying to reduce use of fossil fuels, so large engines in private cars should be banned. For most daily use 1.2L to 1.5L is adequate, anything much more is only a status symbol. For example what use is a Porsche Carrera Turbo on British roads? (used twice daily to go 400 yards to deliver/collect little Jack/Jill on the school run?) Just a bit of overkill methinks. We do now in UK sting some of them with increased taxation, but it don't seem to be working too well, obviously there must be ways to get round it.
And how many Chelsea tractors get used off road, apart from parking on the pavement? If you need to go off road then you need a proper Land Rover (not a Freelander, Range Rover or other modern twee versions or imitations).
And as for pick ups, unless used by tradesmen that need to carry or deliver ladders, cement mixers, mowers or similar tools of their trade, what sort of symbol is that?