Since the car was invented, people have been trying to make it go faster. Up until the '80s, hot rodders could upgrade the hardware to make the ultimate speed machine.
Once cars started turning into computers on wheels, though, and manufacturers started testing the limits of performance, it's gotten harder for the average person to really crank up the speed. You can still upgrade the hardware if you know what you're doing, but in many cases you have to tweak the engine software, too. Well, in the future that's going to change as well.
As electric cars start taking the stage, hardware is no longer an issue. You can't really tweak the "engine" when its motor has one moving part. You don't want to mess with the batteries because they're expensive and potentially dangerous. Steering and suspension are also becoming trickier since they're entirely computer controlled.
That's not great new for the gearhead who likes to tweak their vehicle to speed perfection. However, it's great news for everyone else, because it means that a manufacturer can boost a car's performance with a simple software update.