What's the point of having Actions on each class list that do the exact same thing then? It's arbitrary from both perspectives at a first glance, but the difference between having the same exact button in the Role Action list as a Mandatory Action is it saves 2-6 buttons that all need individual icons and reference points in macros and the translator chat function. I've already explained to you that you need to justify splitting the actions into each class and gone through the nuances to justify what works and what doesn't. You have to justify adding them into each class as individual skills if you want to discard the system. And if they're similar enough people will just use what they find most convenient to describe them anyways.
The Situational Actions are on SE to make use of. If they don't want to use stuns/silences and so on because of what I assume was bias from Gordias Savage (there was a lot in that tier that got shafted by the fact they screwed up the numbers badly) that's on their raid design team for not figuring out a way to communicate that that CC is needed. And given they added a Raid Action button to the list I'm guessing they're gonna abandon it in favor of more Raid Action buttons anyways. Personally I'd rather they just give everyone a basic Silence/Stun/Root/Knockback and so on with appropriate names for each role and moved on, but I don't expect them to.
As for customization, this game already lets you level every class. That's supposed to fill that niche. I'd rather they actually fine tune classes and hone in on the problems have had with them and go and alter their gearing system to enable people to farm BiS gear for every single class on patch if they wanted so they can try a different class in Savage/Ultimate without having to make and gear up nearly a dozen alts. At the end of the day a talent tree where you choose between 'buff/burst cd/AoE' or 'good stat/bad stat/okay stat' doesn't actually mean anything unless SE actually wanted to put in the effort to make those things work, and based on interviews with Yoshi-P, they don't. The best we can expect is that they will learn from Role Actions and not abandon it entirely, as removing it is a step backward.