There are a bunch of different philosophies through out the archery world. You can look at the worlds top archers and even they each have different tuning techniques. I've read and watched stuff from Tim Gillingham, Levi Morgan, John Dudley, and others and they all say stuff that contradicts each other. It's not about doing everything, it's about finding what works for you. For some that might be doing everything, others it might take very little effort at all. In the end, shooting through paper works. Bare shaft tuning works. Walk-back tuning works. Broadhead tuning works.
It's all about just understanding what your end goal is and not losing sight of it. The end goal for hunters is to kill an animal with a fletched arrow and a broadhead on the end. Whatever you have to do to get a fletched arrow with a broadhead on the end to fly the best possible, do it. If that means your bare shaft tune is no longer perfect or your not getting exact perfect tears through paper anymore, don't stress. You're not shooting bare shafts or field points at an animal. You're shooting broadheads and while MOST of the time all that stuff will give you the best broadhead flight, sometimes it only gets you close and then you have to tweak things to get your broadheads perfect.
My best advice if you want to shoot fixed blades well, is to shoot fixed blade broadheads as much as possible and shoot them at every range you shoot your field points. As already mentioned, you will have to adjust for longer distances slightly (In my case I have my sight tape set up for broadheads and then adjust slightly at longer distances when I am shooting my field points.), but it will make you a better shooter, as fixed heads are not very forgiving and really good at showing inconsistencies in your form. Shots that would be off an inch due to shooter error with field points will be off a few with a fixed broadhead.