I agree in general, never liked Python at all, but this part:

Why so many different ways to declare an array-like structure? Tuples, Sets, Dicts, Lists? Dude... ffs, I know each one supposedly has a "different" purpose, I literally don't see any good benefits on it. It just makes me more confuse.

It just speaks of your inexperience. You mention Java in the title, you've never worked with HashMap and other basic collections? This isn't something Python changed, it's a staple in modern programming languages. And with "modern" I mean that Map was added to Java in version 1.2.