What you need is enough headroom in your panel to pass inspection. That's generally more than you really "need" at any given time, but good luck convincing the inspector that you will be fine because you won't charge your EV and use your dryer at the same time.
Most homes were built with enough headroom to power all the appliances that were present when the home was built, and that may not be enough if you add a 50-amp car charger. This is often the case for older homes that had air conditioning installed at a later date -- there goes your headroom!
As a homeowner trying to own an EV this sucks, but as a home buyer this is good -- people should be able to have confidence that electrical systems can handle the load the appliances in the home are capable of drawing, and it's not unusual for people with families to do laundry, cook, and charge their cars at the same time.
