A lot of the main issues with SCH are not being addressed with Endwalker

[Shurrikhan]

of which I can think of a million that are more interesting

Like?

If the idea itself is to outright remove some of what little depth remains, then those alternatives ought to be at least very readily and vividly imaginable and that removal clearly a necessary step in bringing in those net positives.

I don't think Dissipation puts SCH "at war with itself" any more than any other choice of spender does. The fairy is, at the end of the day, a clunky HoT with exclusion windows that exist specifically because of Dissipation, and I see nothing wrong with a situational burst option by which to trade that HoT for immediate resource and added shield power (via Dis's healing mod) during any but the least opportune times. (And no, I don't think exclusion windows are a bad thing; they're largely what gives skills like Meikyo, Hypercharge, Perfect Balance, and Tri-Disaster their complexity.)

Lastly, before we disparage a skill for being "situational", let's note what's happened to those jobs, such as Monk, that have replaced their "situational" skills with those with minor but consistent gains that flow about as well as tarred chunks of rock. Replacements for situational "bloat" skills just to make their use more regular has only resulted in obligatory bloat, reduced choice and skill ceiling, and (even if merely correlatively) reduced fight complexity and/or diversity. Or, at best we get something altogether "new"... that in turn merely siphons away from what used to be more functional before that shiny "new" addition.