Sure but the rpi's can be quite price misleading. If you go pick them up at your local retail store that carries them its frequently a $120 date by the time case, heat sink, powersupply, and disk are thrown in. The base cost for the 8G rpi is something like $70, Then you still have to figure out what to do about the missing RTC, SATA, whatever, for a lot of applications.

So, yes its obvious that the $35 model (which at a minimum is really more like $45 because its not usable without a powersupply and maybe SD card) is sufficient for a lot of things. But its also being wedged into places where its not $35 anymore and in those cases its fair to compare with more expensive boards if those boards come with features that someone is adding a hat or external device for.