I had just gotten into Arduinos when the first Raspberry Pi came out.

I noticed I can do 90% of the stuff I'd use an Arduino for with a RPi, except I had the full power of an internet connected Linux machine available. The Arduinos are still collecting dust somewhere =)

But now we have the ESP32 filling the same niche along with the Pi Zero W, so I don't really understand the purpose of RPi 4 and 5. They're not cheap compared to the price nor very powerful in any measure.

You don't even need a full laptop, any Chinese miniPC will blow the RPi5 out of the water AND some of them have expandable storage+RAM, while also having 5-20x more CPU/GPU oomph. They do consume a few watts more power, so there _might_ be a niche for the Raspberry Pi, but it's not a big one.

You don't buy the Pi for its price: performance as a desktop replacement, you buy it for the incredible stability of the platform as a target, the support, and the addon ecosystem. If you want to screw around with taking a motherboard out of a laptop, go right ahead. €160 for a 16GB Pi5 that I know for sure will be available, replaceable, and supported for the next decade is more than worth the small investment.

> I don't really understand the purpose of RPi 4 and 5. They're not cheap compared to the price nor very powerful in any measure.

They are good for commercial installations like smart displays in stores (think big screens with menus behind fast food counters) and information kiosks. The extra HDMI port lets you drive two screens with one pi and the extra processing power keeps the UI smooth on high resolution. They also have hardware acceleration video decoding for shops wishing to play hi res promo videos and hobbyists building media terminals.

Cost is not a major concern here because the installation volume is low and there are far bigger expenses anyway. Just take a look at how much commercial displays are. The Pi company’s future supply guarantee is also nice because you know that within a given number of years if something breaks or you need another screen, you can just buy another identical pi and be done with it. Good luck sourcing a Chinese mini pc with compatible footprints, port orientations etc five years down the road.