Agreed, adjusters are never found on off road race cars. Once shocks are tuned correctly they are not needed.Compression adjusters in my experience are a sort of set it once and forget it thing, they're more for feel than anything. The novelty wears off pretty quick I opted out this round and just had Accutune do my valving (Amazing BTW).
As for arms (and Kings for that matter) you really need to be honest with yourself, how are you going to use this thing? Race parts require more maintenance and attention than OEM parts, spherical bearings perform better but require more attention. These are things to consider with trying to save some coin but also stepping up to the next level. As always More Performance = More Maintenance.
95% of adjusters in the type of shocks we use are only compression adjustable so they do have a small usable effect with reasonably large changes in weight, other wise yes they are set and forget for the most part.
Interesting to hear if Chriscosta is adjusting his much?