Baba well said. The major issue with people requesting for solar system installation is just like you rightfully stated, they expect it to power all home appliances. Another issue you didn't point out is the issue of battery and solar panel maintenance. Dust particles on the panel can reduce its output by almost half.
I didn't point out a lot if things due to time and space for it. I only talked a little on batteries. Nothing on solar panels, charge controllers or inverters. Thank you.