Sycho I suggested that you don't need to focus on arms initially as you wanted to get yourself lifting the important compounds well.Isolation is fine if you want to concentrate on definition and size specific training, but overall, do the right exercises you will get some bicep/tricep activation. Sure, it won't be the same as an isolated movement.
You do chest and triceps twice - personally if you're going to do a body part twice, it either has to be back or legs. For every pushing exercise you should do at least twice as many pulling movements.
Yeah i've been going by what you said with my training the last few months, i.e more compounds which is working great and they've(my arms) definitely got bigger aswell as my body overall plus my fat gone down too.
I put them down as twice because it's a rotated workout- on the Sunday it would be Back/Bi then Shoulders/Legs Monday.
I do care a lot about definition....size is somewhat important so i've upped my reps to 12-15 on majority of exercises with usually 4 sets.Sometimes i'll do more contracted(?) training too which seems to work well?
Been doing swimming too lately after some workouts which is helping aswell but not too much of it.