This is just not a practical day-to-day solution. Most people don't have a parking spot right outside their window that they can reliably use for charging. There is often a sidewalk that the cord would have to cross, creating the opportunity for someone to trip and sue you. There is often landscaping between buildings and parking, creating the opportunity for the landscapers to accidentally run over your cord with their lawnmower. Some asshole is going to walk by and unplug your car and then you may be late to work.
Sure, you could it, but it's not a practical solution.
I do like EV's! I'm looking forward to the day when its practical for me to have one. I want less vehicle maintenance and I hope that the cost to charge it is less than it would cost to put gasoline in an equivalent ice vehicle.
You're right that technically you would probably be able to run an extension cord for charging. I'm suggesting that this is a pain in the ass solution. Your landlord is going to tell you that you're not allowed to do that. The spots within reach of your house won't always be open.
Within the next 10 years, hopefully more charging infrastructure will be built. Currently, its not available.
If I wanted inexpensive transportation that's a pain in the ass, I'd just take the bus.