Comment by eszed

Entirely agree, although I think it varies by make / model. Roughly look for whenever a particular car got OBDII, which makes diagnostics way easier (and was kinda the perfect level of digitization, again in my opinion), through (as you say) whenever they started digitizing the cockpit and/or (which oddly - maybe? - coincide, in my experience) manufacturers stopped considering ease of maintenance in engineering decisions. In general late-1990s through 2005-2010. Cars since that decade (or so) are more sophisticated, at the expense of far, far shorter useful lifespans.