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Apple just trying to be Apple and "being different" just for the sake of it.
This has nothing to do with this and IMO has to do with Apple simply taking privacy more seriously than Google. I personally like this behavior compared to Chromium browsers and also find it technically superior.
This makes every private tab its own private container basically, which feels like the right implementation of privacy (what Chromium does is shares information between tabs in private window, which definetely is not privacy respecting - it can be more practical, yes, but that is what normal tabs are for).
I understand your preference, but until we have 25 people in our team to be able to make things like this an option we are going to stick with current implementation.