"developing countries" used as a politically correct from of third world.
The Gulf countries are developing but very much in a different way and achieving different results than "developing countries" of the third world.
Gulf countries in my experience have things like good electrical supplies, water, sewage, roads without holes, land line phone networks with high penetration, availability of imports at reasonable prices,...
Living in the UAE and Cairo have nothing in common from my personal experience on the comforts of life side.