I think this throwing knive topic is not as trivial as many of you describe it and also the way you would like to change it. I think it may be a game design to make throwing knives not overpowered. It probably is intended to only throw knives, which are trash anyways, but also still will make a lot of damage with all the throwing knive perks. Most of the time you are able to kill people with just one knive throw or damage more than half their HP, which is huge. In my eyes its mostly a perk you have to use wisely in rare situations.
Iam sure CDProjekt can design it differently, but I do not think they should make this perk too easy to use. There should be still some kind of drawback to throw knives, otherwise it would be too easy.