no one likes the ptolemaioi because their founder was a snivelling ratbag who stole alexanders corpse and brought it to egypt.
I prefer Antigonids, but first 3 Ptolemies are another of my favourite Successors, they were good and strong kings.

they live in a desert
I like deserts and desert people, but I don't consider Ptolemies desert people, Saba and Numidians are.

the egyptians werent conquerors or warriors, they were farmers
yes, but your warrior class are Greeks, Makedonians and Galatians, so you can have Egyptians farming and making money for your expansions with these three nations in armies

They are Yellow
What's wrong with yellow color???


Actually, in the beginnig Egypt was the most stable successor kingdom, Egyptians hated Persians, so they adored Alexander who freed them and they accepted Makedonian rule, yes they were farmers and so they were happy when they didn't have to be in army and their rulers were tolerant to their culture and religion. Unlike Seleucid empire, where Persians who were defeated and conquered by Alexandros didn't accept Makedonian rule. Revolts in Egypt started as a consequence to later weak kings. So in 272 BC they are on a good starting position to become great empire if a wise and strong king (the player) controls them.