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I mean, I really, really hated how 64 and Sunshine kicked you out of the level just to make you enter it... again. That completely ruins the so called "open world" experience of the game that it was trying to deliver. 64 was the first 3D Mario adventure, so that was forgivable. By Sunshine, the developers knew what worked and what didn't, so that game has no excuse to be doing the same thing all over again.
Both Galaxies also kicked you out of their levels when you collected a Power Star. So I don't see what the complaint is about.