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

[Silver-Strider]

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.

Honestly, I'd give SCH a system similar to SMN's Ruin 4 mechanic with slightly more depth to it.
So, each time SCH uses a pet ability (Whispering Dawn, Fey Blessing/Consolation, Fey Covenant/Fey Illumination) you gain a stack of Ruminate, up to a max of 3. Ruminate would deal damage equal to our nuke spell and applies the Virus Status effect once a minute. Replace Dissipation with a new skill called Conversion Tactics that we can use to exchange excess Ruminate stacks for Aetherflow, which we will have extra simply due to the fact we spend Fairy abilities faster than we'd spend Ruminate stacks with a soft 1 minute CD on the skill, and just like that, we have a much more interesting mechanic that converts Ruin 2 into a utility spell for SCH, still allows the accumulation of Aetherflow and while it would miss out on being a part of the opener due to not being able to use it without Ruminate stacks, the DPS loss of that would easily be negated by allowing for more liberal usage of Conversion Tactics throughout a fight to gain more uses out of Aetherflow abilities, which in turn allows for Aetherpact to be used more as well, saving even more time for DPS gains to occur, not to mention lowering the strain on Healers by the return of the Virus status effect which would help to accomplish the same overall effect of the heal buff from Dissipation.