This sounds like copy written by someone who hasn't actually spent a lot of time with the automotive world and in trying to sound like they have.

Electrical connectors on automotive harnesses are far, far more reliable now on modern cars than they ever have been in the past, even with the increase in number of such connectors.

Companies like Delphi and Amphenol put immense engineering effort into the way modern connectors are designed, with weather sealing and contact plating that is way better than anything pre 1990's-ish was. Plastics really got way better after the turn of the Millenium compared to what they were before- I remember working on 1980s cars in the early 2000s (so, 20 year old cars) where connectors would ofter crumble in your hands when disconnecting them, or have completely corroded terminals, terrible sockets that yield and wouldn't keep continuity, etc. Compared that to all the cars I've worked on in the last 20 years where connectors have just not really been a worry (among the brands I've work on, at least). The electronics / sensors / modules themselves are much more likely to fail than the connectors they attach with, in my current experience. The only time connectors seem to fail is when cycled roughly/wrongly by people doing service incorrectly. Failure in place? Rare.

Anyone who thinks automotive electronics were more reliable in the past, live a bit with the electrical systems of a car from the 1970's thru the mid 1990's and report back to me on how that goes. Bonus points if it's Italian or British.