I mean they coud still easily change the skill, but from a demonstration PoV, it's clearly a very PvP centric skill or only usable against casters which severely limits it's use. If I were to make a presentation and show something like that I would only do so if it's my intention to show how different and thematic I can be with this system, so the crass difference is probably intended. The Kyrian skill is clearly single target centric, wheres the night fae one is heavily AoE centric but due to the haste still very much usable in ST. To compensate this with passives will be a challenge to say the least, I agree.
Even besides the 1% meme, alot of people flat out underestimate the raiding climate. I've been in all kinds of guilds and there is usually a minimum level of effort that is expected of you, even if you just try to raid heroic. Peer pressure is a thing and even if you yourself don't min-max, others do. Constantly getting called out for throwing away DPS because of poor choices is annoying as hell and won't exactly earn you favors in your guild/raid. Many of the weaker players have for years followed guides by better players and made it practically law that you have to play a certain way. Expecting, in some kind of grand delusion, that this time will be different seems naive to say the least. The reality is alot of people will be pigeonholed into certain covenants depending on what they usually do or try to achieve. I see that being especially true for the competitive crowd, including MDI and Arena, but even the more casual players will be affected by it, even if the WQ-raiders here are desparate to deny that.