Worked with someone who had a 7650. Watching what that could do blew me away at the time. First phone I saw that genuinely acted like a PC in your pocket. Bought a 6600 as soon as it was released and loved it.

You could probably make an interesting article on how much a modern smartphone in 2021 differs from the 7650. Fundamentally I don't think it's as much as many would think.