i am the same exact way and i think you just explained the reason why you need to know why its to help you memoryor at least partly i think by making the information relevant it gives more for your brain to latch onto to remember otherwise you are just memorizing a fact very difficult for me to memorize facts i would have to make a song out of it or some catchy phrasemnemonic device to remember   its smart that you intuitively ask the why without a thought you know you need the answer to remember plus it makes it much more interesting to remember god knows we need interesting in order to stay engaged i just think its common sense to explain why to ppl i dont think all ppl get why this is important not just for those with adhd but for anyone you are teaching in order to rememberi would think anyway