Finally I've reached Diamond solo queuing

Congrats. 

I don't really think I ever would care to get Diamond, or even Plat III though I won't stop myself if I do, mostly because seriously, the way this ranked system  works is you only go up if you only play this game.  Or you are a natural Apex Predator...which is absolutely no one. 

The amount of time it takes to go up rank is simply too long for me.  I have other things to do.

This is why while I do think kills should be a part of the equation, placement counts simply for too little as you go up rank.  I mean, you ARE playing people supposedly of your own skill level so placing should mean a lot more than it does. 

The reason I think they want the scoring system to work the way it does is that all Battle Royals have nosebleed dreams of being Fortnite, and they want there to be lots of action in their games.  What Apex, and other games, don't really realize to me is that if you are a copycat game, you simply will never be the top place game.

It would be much better if Apex kept improving its design and made its scoring system more balanced for all rank levels.  That takes work of course, but unless that work is done, the scoring system will always be lopsided and mutated, and never be better than their competitor games.