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I used to have that. It was my Nokia n900. I was able to pull up live thumbnail previews of all apps running in the background, and this included live simultaneous previews of: youtube videos in a web browser, games, and Debian, without lag. Try doing that on today's technology. It had a wonderfully acurate resistive touch screen that was pressure senstive that was really good for drawing and coloring! The camera wou…
You are not alone, I have two good friends that still have theirs too, and nothing will ever be good enough for them again. That phone spoiled them, and is the direction they wish phones went. Alas, they have gone the way of the masses instead, but you know if someone like a OnePlus came out with a modern powered phone, with a big battery (phone size doesn't matter to us), a physical keyboard, dual sim, expandable me…
Also, look into the neo900 project and Pyra. Neo900 is trying to upgrade the n900, and Pyra is the successor to Pandora, which is a pocket computer in a semi-similar vein to the old nokias. Neither is finished, but they're worth a look.