My definition of a trad bow is whatever bow you could hand to one of our cavemen ancestors however many thousands of years ago that bows were invented and he would know how to use it without any further instruction. I'm sure he would do just fine with bows and arrows made out of space age materials. He wouldn't know how to make one like that, but he would sure know how to use it. He might not have a shelf on the bow he made for himself, but the first time he nocked an arrow it would be obvious to him what it was for. Whatever other gadgets came on the bow would probably leave him scratching his head.
I've been teaching classes of youngsters how to shoot at my club for more than 30 years. We offer each participant the option of a recurve or a Genesis compound bow. 30 years ago, all the compound bows would be chosen first, and if there were more students than compound bows, the ones that were left had to use one of my own recurves that I brought to the class until they could finagle a turn with one of the compounds. In more recent years, I’ve convinced the club to buy some recurves to supplement the compounds. Now all the recurves fly off the rack first and the finagling is between the students who were stuck with the compounds to get a try at one of the recurves.