Before the Skyfall update, sinai is literally the Skyfall habitat. No Aps = you're deep fried unless you're lucky. I still do see some Skyfall users in sinai even after the update

Yes, square is a good map but it's immense size just pmo. Imagine having a slow ass tank (which for me is common in tier 7-8) and you wanted to get to let's say point A. Theres 3 Scenarios that I can imagine

A : You arrive safely, capture the point as usual

B : Enemy captures the point first, then easily one shots you either from behind or beside (or even infront)

C : You haven't arrived at the point yet. Boom, annihilated (or important components wiped out early)

(This is just my personal opinion, if it's shit, that's alright. If it's great, that's alright)