RPi's may not be as reliable as other advanced machines, and they may not be the ideal choice for Lightning Nodes. However, I specifically inquired about their suitability for Bitcoin Nodes (not Lightning). Personally, I am using an RPi with a case that supports M.2 SATA SSD, eliminating the need for a USB cable. I can't see the reason to not recommend a cheap lower-power RPi for a non Lightning node, that's why i asked.