As I say, for 90% of the game, there is no skill involved. The 10% skill comes from knowing the maps like you mention and being able to aim/out smart players and getting to the end game, and the end game is where your skill will show. But any game that relies on loot or rng based elements can not be a skill based game. Ever. Plenty of people hold that opinion.
It's all very well saying "there is loot if you know where to go", which is great, but you might not be able to go there if the flight path is rubbish or if it's directly over so it's a busier than normal drop, in which case you have to rely on the building you landing at having a gun in. Also, you might think certain places are consistently good loot, but they aren't, the nature of loot tables prevent that from being the case. Whenever I land in Rozhok, I always land at the same building, and the loot is never the same. Some times I'll land and get an Kar98 with a 4x and an M4 nearly kitted out and can go on a charge, other times I'll land and there won't be a single gun in the building and the guy next door is kitted up and blows me away. Where's the skill involved in that? I might be a better player than him but because the game screwed me over with loot, I can't really use my skill as I don't have a weapon to attack, you could argue that the skill is being able to run away and get kitted up to stay in the game, but in a busy drop like Rozhok, again, you're at the mercy of who landed where.
I love the game, I'm not trying to discredit its success or take away from the fact that you can be good at the game. But your skill is worth nothing if the game feels like dealing you an unlucky hand and giving you no loot. I mentioned the end game, even then, as much as there is skill involved, the circle can screw you over and give someone who is terrible a brilliant position, skillful players will sometimes be able to overcome that but again, there's random element to it, which prevents it being all about skill