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Raspberry Pi - Introducing: Raspberry Pi 5
(www.raspberrypi.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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So an additional device hanging in the breeze just to gain even some features and pico is hardly a replacement for full rpi gpio. Doesn't really seem like a better solution.
It all depends on what your usecase is. If someone's just starting out and wanting to do gpio stuff with a Linux os, yeah the pi may still be the best bet since it's got such a large following and guides written. But if someone's got more experience and just needs a cheap small form factor machine to run Linux and interact with some non mission critical gpios, a small nuc with a pico will give you a greater bang for the buck!
Obviously it is usecase dependent. But original comment claimed you are better off getting a small nuc for the same price, as if it is better for any usecase. Please, go reply to them :)