I think one thing is certain, that the new appointment will work within the clubs structure and will have little impact off the pitch and away from the senior squad in regards to club strategies.
Whilst the likes of Arteta, Faria and Buvac may all be held in high regard within the industry, it is primarily in the context of their current roles as coaches and assistants executing someone else's tactical system and formation. Whereas at least with PV and Nagelsmann we have a couple of years as managers to be able to see what their preferences are.
On that note perhaps it should be pointed out that Bayern Munich are replacing Heynckes with Kovac as manager next season. Kovac has a similar amount of experience in top flight as Nagelsmann, although the later has qualified for UEFA CL in both seasons whereas Kovac avoided relegation when he took over, and finished just outside Europa this season but has reached the DFB-Pokal Cup Final. Both have less than a dozen more games as club managers than PV.
The only way I can see a complete novice being appointed as Head Coach would be if the club already had an established system in place regarding tactics and style, and that they also had the roles in place to sustain that continuity - much like Barca following Cruyff's blueprint, or even the LFC Boot Room era. We have neither and our new structure is unproven as yet on its own merits. As such it is perhaps too soon to look to appoint an unexperienced option such as Arteta.
McVay may well have been a rookie as Head Coach at the Rams last season, but he started as an assistant coach a decade ago, and spent at least 2 years as Offensive coordinator with the Redskins before landing the role as Head Coach at the Rams. As such his appointment is perhaps not as left field as perhaps would be if AFC appointed Arteta as Head Coach after only 2 seasons in coaching.
