but the content won’t likely be the same across regions. netflix for example has a very different library depending on where you are in the world. eg CANADA had about 50% of the US library in 2016 (many other regions sitting with UK/AU around 30-40%)

... but it still costs the same, and that’s not even the part that’s frustrating

Apple owns the rights to apple content. As Netflix does to most of their original content. So their original stuff will most likely launch international. What Europe won't get is all the channels cause those might have different plans for different markets. Disney already talked about an international launch of Hulu and most of the HBO and Showtime stuff is on Sky in some European markets which has TV app integration already.

So no we won't have the exactly same stuff but most of it will end up there one way or another (except Netflix)

When it comes to original content - and that's the main appeal of Apple TV+ - I'm confident that Apple understands that staggered releases aren't really an option these days. Netflix releases their originals at the same time in most markets. I'd expect Apple to do the same.

The access to third-party content (or lack thereof) isn't in Netflix' hands. That's basically the reason why they double down on their very own originals.

I doubt that very much. They've pretty strongly implied that Apple TV+ is just Apple original content, not like Netflix or Amazon where its a mix of Originals and licensed content. If they own the content, they can distribute it wherever they want.