In a sense, you can just plug in electric cars. The issue is that most "residential" electrical circuits don't give enough energy to charge an EV in a reasonable amount of time. As far as I know, most EVs can be plugged into a standard US wall plug but it will take north of a day to charge the batteries. So not exactly convenient.

So the chargers aren't just devices you plug into an existing receptacle like a laptop charger, they are special dedicated circuits that directly run back to your home's main electrical distribution panel to give more powerful energy directly to your battery. Even so, these kinds of charges might need an hour or two to recharge your batteries.

Special 'high-energy' charging stations use levels of electricity that your home doesn't even have, they require dedicated transformers and gear on a more commercial or industrial scale and can charge your batteries in 15 or 20 minutes.

EDIT - so to be clear, all these different sources of electricity require various equipment to make them "receivable" by the car. It would be like your cell phone have a powerbrick built into it with a USB-C and USB-Micro connector, a 2 prong and 3 prong 120V receptacle, and a NEMA plug, with all the various transformers required to charge the battery properly. That's clearly a dumb way of designing a portable product and we have various power cords, multi-adapters, and power bricks built into the wires we use to charge, and not into the cell phone itself. Same-same with EVs.