Back in the 70s most people used less electricity. We didn't have so many electronics. We had no charges (we now have a charger for everything), our kitchens were simple. Heck, many people didn't even have a color TV, I know I didn't. But today things are different.
If you feel you need a bigger panel, find out from the association if it's OK to upgrade, BEFORE YOU COMMIT and have them give you a written approval, then go ahead with the purchase.