hitting .400 without the # of walks it takes to limit your ABs vs PAs... would be extremely difficult. Unless Arraez has perfected the skill of knowing exactly where every batted ball is going, there's going to be some stretches where he just hits it right at the defense for an extended enoughperiod that .400 becomes unattainable. Need those walks to make his hits count more towards the ol' avridge.
To the argument about whether he could win MVP with a .400 average and like 10 HRs with limited other nuumbers ... I dont see it. I definitely see him getting votes.. but it would be like voting Judge for MVP with 62 HRs if he hit .180 instead of .300, played average D, didnt walk a lot and ran the bases badly. The argument there would be ... well yeah he hit a bunch of homers, but what exactly did he do when he wasn't hitting HRs? Not a whole lot.
Same argument should be applied to a guy who hits .400 based on a bunch of slappy singles and relatively few extra base hits, walks etc. What are you doing when you're not hitting singles? Hows the baserunning and defense? Not good? Then.. sorry, no MVP. Cool to hit .400 though