My first computer was a Raspberry Pi v1 that I got when I was 9 (now 19). Definitely not the case for me. I became proficient in using Linux very quickly.
Were you running bleeding edge Arch updating every day though? Probably not. An RPi is fine for kids. The original comment suggested the sadistic Arch setup, which would obviously just frustrate most kids at worst, and waste their time and creativity at best.