I have certainly seen what you see as well, regarding knife stuff (sometimes being too flashy) it's even in my school but as part of something. My Inosanto Kali Lineage is a little weird. It passes from Master at Arm's James Keating to my Guro. This not only lead to some more Spanish sword influence but a "quirk" of Keatings. He taught my Guro, and thus I am taught, with the following method. We first learn a complicated and/or flashy method. Then we are taught the "clean" unflashy method. Keatings thought on that was that if you teach the student the complicated way first when you teach them the simple method the "light bulb" will go off and the simple method "sticks.". I don't have any FMA experience outside of my school however so I don't know how common, or uncommon, this idea is. I also don't hold illusions of being a knife fighter. In terms of "fighting" i look at the knife training as very useful because in learning to "fight" with a knife I learn to better defend long enough to transition to my firearm (thinking work.) I am what I would call a fair "dueler"/sparrer though (with stick and sword too) but that is likely because I spent many years fencing. That gave me an appreciation for what some might call "dancing" but "dancing" only works if both opponents already have their weapons openly at the ready. That's why I say "sparring is pressure testing, not fighting" because as often as not "fighting" starts with a surprise attack. Here is a video that I think illustrates what I am talking about a bit dueling vs fighting... "Prepared" vs "natural position" to get surprise.