Generate +/- voltage outputs using two boost converters?
Thanks to the helpful replies, I’ve learned about inverting buck boost converters.  In case anyone reading this wants to know more about them, here’s    some papers by TI:
https://www.ti.com/lit/an/snva856a/snva856a.pdf?ts=1605152504969
https://www.ti.com/lit/an/slyt286/slyt286.pdf
https://www.ti.com/lit/an/slva721a/slva721a.pdf
I’m still not sure why the noisy ground and symmetry would be any less of an issue with this setup, in case someone can explain that further.