Pretending that any software is 100% accurate in a capitalist setting is a ridiculous thing to do; and every television and car since the 1970s has some software involved.

With cars it generally works well enough long enough in enough cases that that direct ECU or other computer patching isn't needed, because who cares if you have a misfire in every 100,000 cycles as long as the car still runs.

I was originally referring to the same thing in ICE cars that are in EVs, i.e. the infotainment and gauge display systems which are the majority of software updates in either case study, but let's not pretend this is the 1950s for ICE cars; yes your ECU on your shitbox probably does legitimately have a software update that has better tuning, especially if the same engine was used in two separate production years. Guess what they updated to get more performance despite it having the same engine in order to justify the next year release? The fucking software. Also many recalls are software based these days for all the things that aren't directly mechanical, like airbag, or lane assist, or backup cameras, or fuel systems, or the ABS controller. All of those things will inevitably have a software flaw. All of those things can be updated, and are updated at least once during the production cycle if only to add additional hardware support when new hardware is swapped into the same model.

EVs, because they are so much more simple than ICE cars in every single possible way, lean harder on software since that's the only thing that can really be effectively separated into distinct packages and models until solid state batteries come about.