I mostly agree, and did the same with my second gen lab build - instead of shiny new NUCs like I had used round 1, I bought old off lease Dell Xeon boxes. SO MANY PROS -

• Got them up to 14c/28t each
• They can take GPUs and actually do heavy transcoding/ML work
• They can take up to like, 128GB of memory, which is GREAT when they're all hypervisors

The downsides can't be denied though -

• Even without the GPUs and beefed up CPUs, they are power hogs - the CPU alone uses more than an ENTIRE NUC
• They run HOT
• They run LOUD

The same holds true for off-lease SFF stuff, Lenovo and the likes ...

So while reuse/repurpose is absolutely of the utmost importance, no question - when it comes to technology and how quickly it advances and miniaturizes, a thorough and logical pros/cons list is often required.

I'd add another option though - if you do need what a Pi brings to the table - do you really need a shiny new Pi 5? Is it possible a used Pi 3 or Pi 4 would do the trick, and check the reuse box?

The day i can fit the power of a computer capable of emulating the switch 1 in a gameboy shell will be glorious.

l a p p i e s

The only caveat here is the fire-hazard non-removable lithium batteries.

Or get a used thin client (e. g. HP T620, T630, T640 or Dell Wyse 5070). Cost: ~40-100$. Biggest advantage: Passive cooling, i. e. they're absolutely quiet.

You lose the I/O and power efficiency is no comparison. You can get better power efficiency and sometimes some I/O with an old router and OpenWRT, but you'll be in the class of a Beagle Bone and a much harder learning curve. I've never managed to get a sensor or peripheral working on some old laptop's SPI or I2C buses like how easy it is on a Rπ.

It's low power that is still making arm small computers popular. It's impossible to get a pc down into the 2-5 Watt power consumption range and over time it's the electrical costs that add up. I would suggest the RPI5 is the thing to get because it's expensive for what it is and more performance is available from other options supported by armbian.

The power constraints are more important to most than the size constraints honestly.