Because most posters here aren't knowledgable.
Yep. Many go straight to the reactionary than rather ask about certain aspects.
OG Xbox on paper never reached what it said it could in real world performance. Meanwhile the 3DS specs being slightly lower than GameCube has made games that look on par with GameCube with modern libraries and instructions. Better shaders and all that neat stuff. The bottleneck was largely the CPU which has significantly improved now with n3DS.
Even if the NX's specs might sound a tad lower the XBO, it could find ways to be on par or exceed it in real world performance.