* Lower emissions, requiring more expensive engines.
* Making cars easier to recycle (but more expensive to build)
* Adding mandatory accessories for safety reasons. Here you can find an example of what that has been recently added. [1]. Nice stuff, but it doesn't come for free.
[1] https://autovista24.autovistagroup.com/news/what-is-the-gene...
Compact cars in 2025 are the size mid size cars used to be a couple of decades ago.
Meanwhile, the average family size is getting smaller and smaller and the average occupancy is ever closer to 1.
Stellantis for example knew about the problem of their engine blowing up since before 2020, but they chose to ignore it. Small turbocompressed engines are or new at this point and how to make them reliable is known too.
Or take VW, cheating before 2015 so regulation is not an excuse, and since a decade most failures are parts like coolant circuits because of cheap plastic, gearboxes, and a lot of non safety related electronics features. And what is the replacement for family mmovers? Luxury SUVs or 75k€ iD Buzz.
Edit: So in short multiple things can be true: legal reasons for price increases, but also bad marketing choices.
Edit2: actual study showing at least half the price increase was chosen: https://institut-mobilites-en-transition.org/publications/le...
In the US, authoritative data sources[1] suggest otherwise.
You must be young.
Cars used to last five years before falling apart. It helped drive the whole auto leasing industry, because nobody wanted something that turned into an old rust bucket in half a decade.
The reliable Japanese cars came in, and every marker suddenly started offering five, eight, and even ten year partial warranties.
Today, a ten-year-old car is very common. I kept mine until it was 12-years-old, and in that time it never had a breakdown. Just tires, oil changes, and many lightbulbs. My previous cars (Volkswagen, Isuzu, Ford, Ford, Mercury) had long been scrapped by then.