I agree with some of those, but not all.
More than two possible answers in dialogue can quickly spiral out of control. Going from two to four answers quadruples the writing workload, so keep that in mind.
Wrong or not necessarily.
In dialogue situation a you have the choice between b and b' (and maybe some other choices as well. b and b' aren't that different, they possibly both agree but with a different "tone" like extreme and more moderate. b leads to answer c and b' leads to answer c', again both similar but with a slightly differnt tone. Because both are so similar they can be united in result d without being out of place or illogical. It's the "illusion of choice". Just by deciding how to answer you feel to have agency or impact. That's what roleplaying is all about. It's about staying true to your role and not about extremely branching dialogue or storyline...
So of course there would be an increased workload. But not double the amount, not at all. It would be even less than you might think. The most tricky part is the wrting itself...
If you add in a bunch more skills, then sure, some skills which require both Ability X AND Ability Y would work, but right now the amount of skills per class is small enough that adding AND requirements would force you into certain builds whether you want to or not. I've made the suggestion of OR requirements, so Phoenix Dive would require EITHER WotW 3 OR Fire Elementalist 3. I don't think either of those are happening in the base game, though.
I think it would work for support abilities like loremaster, crafting and blacksmithing. For spells? Hm, probably not so much...
