You're giving me flashbacks of all the speculation we had going during Tales from the Calamity, lol. Granted, we got a lot of what we hoped for and most of the rest showed up later, so I'd actually encourage people to talk about all the stuff they want to know more about. I see things in the game all that time that make me wonder if they were smuggled in as a response to people asking questions and making comments here (especially, but not limited to, when Merlwyb articulated her regret and anger at how she was rushed out in 2.55).
Given that Ysayle is probably dead-dead (not only-mostly-dead), I think you're right that it'd be nice to know what she found in her conversation with Midgardsormr and how that led her to the cost-benefit analysis of "Summoning a primal is for the greater good!" Urianger hinted Ascian involvement more than once and I don't remember seeing much of a confirmation of that. The only thing I would have been disappointed if they'd neglected completely was the what have I done moment between her as an antagonist in 2.4 and suddenly our teammate in 3.0; I'm glad we at least got that.