I don't think he ever claimed to be an aeromodeler...
(tho he might be)
He bought an ARF because he didn't want to (or couldn't for one of many reasons) build it himself...
For his reward he is already getting a plane that is a full 1 lb. heavier than a kit build...
The he finds out that the joiner won't fit. Yes it's a minor thing and most guys would just sand it and go on...
But what if he had been waiting for 4 weeks to get it in... tomorrows the Big Annual Funfly and it's 7pm and he finds this out? What OTHER things might he find problematic?
I know SEVERAL TopCAP ARF's went out with half the manual WRONG... literally... the back half of it is for an a Knife... SO a fella could EASILY glue his wings together without the dihedral it requires, and glue in his stab as told only ot find out his elevators won't fit in the slot afterward!!!!
Bottom line is... the REASON ARFS have come a long way and are so nice today is because demands for a higher quality ARF have MADE them do so.
NOW.... to Morris' credit... I have found them to be VERY responsive and helpful. Their intention is to make a product that is clear to assemble and flies great. And I'm sure if the guy decides he can't deal with the adjustments required (however minor or major they may be) that Morris will hook him up.