Country: England
I reckon Arteta may have an experience/seniority bias.Have to play AMN, Elneny, Nelson, Nketiah, Willock, Saka more. These are uncomplicated players who have technical ability. The system has to be designed according to the personnel. First you gather your best players, then you devise a way to play them together. Thats what management is.
Would explain his insistence on Laca and why Saliba and so many youngers are missing.