Another observation , its not so much the reliability of electronics, as opposed to the diminished reliability of an older style vehicle, just the level of sophisticated tools needed to diagnose or rectify in less technically advanced areas. The risk following breakdown can be counteracted eg satphone /money. Another factor is fuel quality required by recent emission level driven vehicle specs , some of which can be counteracted prior to trip eg unimog needing software modification for 3rd world travel .
As to where people travel with concern about electronics , I have travelled in outback australia with vehicles at both ends of the spectrum , but as mentioned earlier the hot and bothered bit can be avoided by taking steps to deal with eventualities if the need should arise, where it can be a concern is if the travel is being done with limited resources self reliance is a lot cheaper , and therefore less of a worry . JMHO
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