Make them simpler?

400+ hp vehicles are common now, 5000lb vehicles handle like smaller cars, efficiency is top notch and this is all while blowing roses out the tailpipe. If you want cutting edge, we have 600-800hp hypercars ready to roll. Modified cars are well into four digits on the street, if you have the money.

Just saying, what further "improvements" will you see?

However, you tell me: who is going to be putting $8000 CVTs in a fucking Altima 3x to reach the lifetime of a Chevy Impala, 265k?

Or whomst is going to drop 12,000 on just the long block for a Chevy LTX V8 in a Silverado. A 350ci Gen I longblock for my truck is like 1600, for reference. Or an LS7 was 17,000 for a CNC ported, titanium rodded, dry sump masterpiece.

Meanwhile Subaru had Practically Zero Emissions Vehicles on the road in like 1996.

Diminishing returns.

It's not efficient or environmentally friendly to make overly complicated cars that won't see 20 years of service. Aka building future junk.