Uncharted has nothing to do with Horizon. 

People complain when a developer releases a game which is unfinished because they hadn't enough time for the game.
People complain when a developer delays the game release because they need more time to make the game good.

WHERE IS THE LOGIC???

Yeah I think this really has to do with the Ratchet & Clank game. You want that game to shine and not be overshadowed by another exclusive coming.

Well to be fair Uncharted 4 crossed the limit about how many UNDERSTANDABLE delays a game can get, as many stated just don't give a release date until you're shure you'll deliver. It's the same as for Star Fox Zero IF they're gona really delay it again with the only difference that SFZ while having less delays was also teased at E3 2014 meaning that people were exepcting an announcement during that year...

Not too bothered. Ratchet & Clank will hopefully get more love now and those playing DS3 will have more time to complete before UC4 release. It's all perfect!

since they explained the delay with something like "getting enough copies ready for a global release", and that right after they announced a free for all multiplayer weekend, could it be that they download numbers are way higher than they expected?

nowhere to be found. Its like people have no life besides waiting for a game...

Whether the delays are strategic and intended to maximize profits for this game and others or they keep having to push the production schedule around doesn't really matter at this point. It is pretty clear that there needs to be a revision in how - and most importantly WHEN - information gets released to the public. No one company has seemed to find that appropriate window, especially when it comes to major AAA releases.

An extra 2 weeks? My wallet and I can deal with that.

I'm glad for this. It gives me enough time to beat Dark Souls 3 without my backlog growing!