If you're in the market for a console, yes. If your idea of high end gaming is 144 Hz blah-blah, you'll be PC only and clearly not a potential customer for XBOX or PS. If it makes you happier, append on '-er' on the end of 'high'.30fps on most AAA titles is high-end gaming experience ?
Edit : Even then, if 6 TF doesn't count as high-end, that means a £400 1070 GTX isn't a high-end GPU. So yeah, XBox One X is high-end.