Hey man no i mean it your Bis and tris are huge! i mean it.

But i get what you mean after a hard back day your tris forearms can
be pretty trashed dont want to work them to much. good to give your whole
body or even one muscle group a bit of time off i do it a couple times a year might be a week or 2 then i get back and seem to get better results.
Ever try using more reps/sets with less weight? i get great results
and when i cut i can see a huge diffrence in my bodyparts even it its not a massive weight gain quality is what you want first imo. so its good to mix it up like some body parts might grow better with heavy training others with lighter trial and error thats what its all about no matter how much exp you have or how big you are.

I do high reps all the time
I would consider how I train powerbuilding, but I use high reps sets frequently. reps of 20 and 50 are not uncommon

reps of 50 squats are brutal at the end of a training session
leg presses are a little more safe for those, but doesnt cause as much over all pain

high reps/volume is rotated not for the workout, but rotated within the workout all the time
I may start with reps of 8-10 for 2 to 3 exercises, then transition into supersets with high reps and just challenge myself to got through fatigue and beyond to make sure I am really done

Not that I train instinctively as some would say, but I like to use variety after my major lifts are done, as well as change the order and intensity techniques to force change.

Oh wow i do something kinda the same legs do be dead and pumped to hell even after my warmup set lol good stuff mate