I noticed a few interesting things in the colors of the info we got of Reality Fracture so I figured I'd ramble a bit.
* Our five hero Planeswalkers are all associated, to some degree, with green. Ajani, Garruk, and Vraska all have had green as part of their color identity. Liliana is firmly rooted in black, but has been working in Witherbloom. Chandra is similarly firmly rooted in red, but now has her relationship with Nissa. (Edit: I forgot to note that Vraska and Liliana are desparked, I just called them Planeswalkers out of habit.)
* Similarly, Jace's commander deck is WUBR, with Green being the odd one out. Thematically there's the Blue vs Green conflict of artifice vs nature, forced change vs natural growth, etc
* On that note, Tam is UG in her color identity. Literally split between the two sides of that kind of ideological conflict. Which brings us to Strixhaven colleges.
* The Strixhaven colleges are each built on the dichotomies of enemy color pairs (Witherbloom is Death and Life for example), and how they are not inherently opposed but instead two sides of the same coin. The Hexhaven schools seem to reject that, instead doubling down on their focus (Vigorbloom seems purely life focused for example.)
* There was actually a similar thing in the lore in the past. The Dragonlords of Tarkir each removed the wedge color from their associated clan. Dromoka removed black from the Abzan and made them Selesnya, for example. (The Dragonlords who disappeared into the dragonstorms connected to the meditation plane, share colors with the Hexhaven colleges, and who are elder dragons just like the Founder dragons.)
* The last point I want to bring up is characterization: The Strixhaven colleges are so brilliant because they understand everything is connected. To continue talking about my favorite college: You cannot have life without death.
Jace is rejecting that fundamental notion. In creating a "perfect" world he's trying to claim you can have joy without pain, future without past, life without death. He is rejecting maybe the most core tenet of Green mana in trying to force reality to conform to something so unnatural.