glad to see you know all the intricacies and intentions of a design that we know literally nothing about past a few seconds of footage
This design is slightly more involved than a version of Samus that I played a couple months back, before they had the ability to give the ice beams different animations, and it certainly addresses some areas where Samus could have improved. But I'm pretty certain, from having been able to follow her development indirectly, that the process for this was more or less, "we can do this now, so let's put it in." It happened to dovetail with the wild-hair ideas that seemed to always infect the Character Idea Submission Thread. Which brings me to this.
As for Super Wavedash, this was a massively requested AT since day 1. Sorry it doesn’t fit into your ideal Samus but we do have to cater to a (relatively) large community, and the majority of the community seems pretty set on this.
The sense that both seem to be caving to popular demands rather than asking the question, "is this really what Samus needs?" is what I find so unprofessional. Sure, both things are cute and flashy, but when the drive to "cater" to popular demand simply because it's popular overrides the desire to have a game that eschews superfluity, I can't really stay silent.
Getting back to the stance system, we felt like PM Samus was losing access to some cool Melee tools – including Extender and Melee-styled wall tethering. We wanted to craft another cool niche tool that was *roughly* lore appropriate to make up for these losses and variations of a stance system were commonly requested by community members. Granted they’re not equivalent in function or role by any means. The stance system isn’t intended to overhaul or totally replace her existing moveset, but acts as one way to give it a slightly different optional flavor. Did she -need- this? No, but since we addressed what we felt she truly needed first with core moveset tweaks and offered this as a purely optional, straightforward tool I don’t really see any reason to get too upset.
Ultimately, this comes down a fundamental difference of perception that has really plagued Samus for the lifespan of Melee. There has always been a faction of people who seemed to perceive her as the "trickshot" character, with all sorts of neato hidden tools. But if one spent enough time on the Samus boards back in '06 and '07, there was a distinct impression that this perception was disparaged, because the players that devoted a lot of time to really thinking about Samus and pushing her metagame forward had by and large abandoned that playstyle, and really only tried for all that stuff to demonstrate disrespect for their opponent. They knew that Samus was a much more cerebral character that was more about awareness of habit and spacing. In this view, Extender was only debatably useful, and even then the argument for its utility was mostly upheld by the fact that it was unquestionably a massive buff to Samus's grab; and SWD was more or less seen as showboating. The only thing that has been lost is really the wall-tether stuff, and that's been replaced by new tricks that arise from the Brawl tether mechanics, which are probably actually better in the long run, at least within range of the ledge.
And don't get me wrong, I actually liked the Extender in Melee, and felt that it was underutilized. But Extender was an install, which is a pure buff at substantial cost, which brings its ultimate pros and cons to an even keel, making its inclusion pretty trivial, as is the case with many installs. This is why there was debate, not widespread acceptance, of Extender's utility. The question was always, "is it really worth it to take time that could be used for charging the charge shot, so you can get a better grab?" The stance-change beam is just that--a stance change. And stance changes are typically not trivial. In fact, the swings in playstyle they usually necessitate almost always make them central to the character. That's the opposite of trivial. We're talking about making a typically character-defining design trait that's being used as an Easter Egg. This is another part of the problem, and it's what makes the stance change feel so unprofessional to me. The fact that Beam Change was presented as an even exchange for Extender without really considering the typological differences between the two makes me wonder...