barebottom is definately not silly. if you plan on having big healthy fish, when they are young barebottom helps insure that. with gravel pieces of food can get trapped and rot, that will foul the water pretty quick with how much you feed discus, not only that but if the food is rotten and a discus finds it and eats it, that can lead to internal parasites and you may lose them. its not required, but if you are gonna start with young discus i would highly recommend it, it makes waterchanges sooo much easier cause you can get all the uneaten food and the waste out of there. you wont regret doing it.