What are advantages of building a screened porch all around a house? What are the disadvantages?

I'm thinking privacy a plus.What are advantages of building a screened porch all around a house? What are the disadvantages?
It will keep the house a lot cooler during the hot days. But at night will cut back on the evening breezes. No mosquitoes , no more flies, it has it pros and cons. But I love screened in porches , just hang a swing in there and lay out in the evenings. They are nice in the country.What are advantages of building a screened porch all around a house? What are the disadvantages?
extra place to relax! also helps keep wind/rain off the rest of the home. room for kids to play. also lots of curb appeal!