When the company who actually manufactured those products says they are not, then sorry your opinion isn't going to stand.You have to entertain the fact that as time passes, new revisions of the same hardware are released and they have increased stability, simply due to the fact that the manufacturing process has been perfected or because one part has been replaced with a newer generation one, or because the manufacturer thought that this slight tweak will increase the overall experience. As long as the end hardware runs the same software under the same firmware and there is no exclusive content for the new edition, we can't speak of a successor but of a revision. The DSi had exclusive content, the Gameboy Colour had exclusive content - those are not revisions, they're successors of their previous consoles.Nope, the Slim has a stronger CPU/GPU. Just google for "360 slim faster" and you'll find evidence for that Too bad no one actually went on and proved it with hard proof. It's mainly people's experience, so nothing trustworthy, but if so many people say it, I don't see why it shouldn't be a believable change.
Sure, no Slim-only software coming, but that was just MS's call. Still, I'm sure pretty much nobody in the world calls the DSi the successor to the DS
The GBA SP saw several revisions (4 if I'm not mistaken), all of which had small hardware differences. Did either receive any special content? Nope. I'll look into the whole "Slim is Faster" issue, but I don't expect the differences to be substantial - the general setup remains the same, what changes are minor components, their layout or the technological process behind making them, not the core design.
It's futile trying to argue this case. Otherwise DSi sales wouldn't be counted towards total sales of the DS series, Nintendo created DSi as a revision with slightly more capability.