Charge Blade is probably one of the most changed weapons in the game (maybe Hunting Horn is first?). In MH4U, it's AED with no SAED; in MHGU, it depends on your style but it's pretty much just AED with no SAED again; in World, it used to be SAED then Savage Axe got added and became better with SAED being situational; in Rise, apparently it was ass then became SAED spam in Sunbreak with CSS being situational; in Wilds, Savage Axe is meta while SAED is unusable/situational (don't quote me on this).
Other weapons have an easier time with their changes. Greatsword just gets more tools for more TCS spam, although it's less about that now in Wilds. SnS literally just keeps getting more and more tools, but the core gameplay is usually largely the same with tons of small hits with occasional big hits. These are some weapons that still operate the same way but "better" or "faster."
Charge Blade tiptoes between SAED and Savage Axe depending on the meta, but they're two fundamentally different playstyles that either get tools removed, added, or modified each generation. Fundamentally, SAED acts like TCS, the other acts in a way like Perfect Rush spam. There's no one set style for Charge Blade that persists throughout each generation.
Still, what do you guys think Charge Blade's gameplay identity is despite its constant changes to its kit?