I've had a change of heart about Brown. If no one else watches 1014 Rugby on Youtube I'd seriously recommend them, I've learnt a lot from their analysis (I hope this doesn't count as advertising as I have 0 ties to them, I'd honestly just recommend them, they deserve way more publicity than they get), and recently they've focused quite a bit on the idea of the spine of the team; the 2, 8, 9, 10 and 15. They're considered to be the leading decision makers and the players that should have most experience and should be the first names on the team sheet. EJ clearly buys into this philosophy; since his reign began, Hartley, Vunipola, Youngs, Ford and Brown have all been first choices when fit (other than Burrell's 20 minutes in Oz and some experimental Care cameos), and furthermore have all captained or vice-captained at some point.
It's also no coincidence that in 3 of the 4 home nations, the biggest selection controversies are their fullbacks (Brown for England, Kearney for Ireland, Halfpenny for Wales). Almost all supporters of these nations want these players dropped for more exciting, younger players (Watson, Carbery and Williams), yet the nations' coaches refuse to do this. The reason why is simple, it's because we play suffocation rugby; we revolve around reliability in defence, in our kicking and under the high ball. Sure, Brown isn't a bonafide linebreaker like Folau or DMac but when he's he ever dropped a high ball, made a glaring defensive error (other than that Betts humiliation) or put in a poor kick? He doesn't. Does he need to learn to pass the more ball instead of running himself? Absolutely, but I'd much rather keep a player who has 62 caps, all of the core skills but just needs a slight change in attitude than risk a fullback unproven at test level in that position just 2 years before a world cup who is, IMO, more suited to the wing anyway.
I'm not expecting everyone to agree with me, but this is the opinion I've come to adopt (as hard as it is considering that it likely means Nowell no longer making the 23).