I think someone already confirmed that these class builds cannot swap class features with their parent class - it comes as a package deal.
Wow, that arid land berserker gets a +3 untyped bonus to AC...
IMHO that is too much... together with unarmored agility and hafted defense and mabe a defensive weapon, you really get some high AC...
I really believed that it was common now to give out shield bonuses in such cases...
Yeah, I noticed that too. I think that they didn't make it a shield bonus so as not to prohibit the player from using a shield. But even still...
I almost wonder if what they should have done instead was give them Unarmored Agility for free, along with a +1 bonus to AC. This would at least keep them from combining it with Unarmored Agility, which is the big offender here.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.