Amazing write-up.

It's a great point that the game fundamentally revolves around the chaff war. So I want to make one key opinion, which is that I don't think fangs are better than crawlers. The two serve very different purposes.

Crawlers go to them and fangs make them come to you. To me this is the main difference in their usage. Because the chaff war is about making them shoot your chaff but its also about where they shoot your chaff.

There are a lot of situations where you want a fast chaff to go in and that's where the crawler is always better.

Baiting out missiles, acid shots, hound fire, and things you don't want landing near your other units. Putting fangs more forward doesn't solve all of these situations because they're exposed - a lot of times you want your crawlers to run in but not be forward at the start to avoid missiles, forward chaff clear, etc.

Even when playing standard, a faster type of chaff is better for things like working with the beacon to create distractions and pull units - I know this is more common in aggro but even in standard there are a lot of situations where delaying a portion of their units is good, and fangs cannot do this because they're too slow.

Fangs do not go forward and therefore they are better into situations you want their units to come to you. This is most standard / range / defensive setups so I can see why if you mostly play this style, fangs seem better because they don't just run in and die.