I agree on the electronics point to an extent. As far as fuel goes, you generally are okay as you can bring octane booster and cars these days have knock sensors and can regulate themselves in the event of poor fuel. I've gotten some terrible fuel in Africa and Central Asia in the past, but the cars kept on going.
The good news/bad news with electronics is that you end up with a highly efficient vehicle, but with a million sensors that can break or have issues. As long as you know where those sensors are, how they work, and you bring a code reader, you can generally diagnose and fix most issues.
When I've been on the road, we seem to always debat which is more reliable..the new car, or the 30 year old car. In the end it seems to always come to a stalemate! Each have positives and negatives and I think it comes down to the person behind the wheel and his/her knowledge and experience.
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