Raspberry Pi was designed for education. As any popular product is bound to, Raspberry Pi has been criticized a lot (Lateral Opinion and C&Y are typical examples) for things like lack of a box, absence of supplied charger or even WiFi.
Seriously, since the EU bill everyone has a spare micro-USB charger, and kids have suitable boxes in abundance. Most importantly, these problems are solvable: you might need to buy an USB hub or dig through some old stuff to find a forgotten micro-SD card, but that’s it.
Raspberry Pi has a much more fundamental flaw, which directly conflicts with its original goal: it is a black box tightly sealed with patents and protected by corporations. It isn’t even remotely an open platform.