After thinking about it more, I think Grounding is the better option, mainly because of Ling Qi's plans- both for MoSS in general and in the long term.
Ling Qi wants to use MoSS to train her priests and Ministry of Spiritual Affairs. That's goal number one. Goal no. 2 is she wants to introduce Weilu methods to the Foundations and hopefully the Emerald Seas in the long term.
However, as Wang Lian said, though the Weilu methods are good, they are too personal. They require individual relationships with spirits and thus are difficult to scale up.
Ling Qi nodded her head. That was a fairly common line of thought among the more moderate sort of imperials. "Many spirits are dangerous, alien, but as you said. They change by being near us, bonding with us. I will make no apologies for treating my spirits as kin."
"It's good that you're not spineless about it, dancing around me with words," Wang Lian agreed. "Come lets get a cup of wine. "I don't disapprove of your method, I just don't think it works at scale."
Grounding HELPS with that. It works on multiple targets, like wards, and creates a lingering effect afterward. This can help set the ground for further rites and rituals instead of relying on a spirit liking you before it squashes you. I'm confident that this can and will help with scalability.
Firstly, one person can pacify and neutralise many spirit's effects without active engagement. It won't go a long way towards standardisation - we'll need to make more tweaks to MoSS for that- but it's a start on that path, imo.
Plus, Dispersion feels like SNR and Grounding feels like TRF. Even though Dispersion may be more "active", in a fighting sense, it's difficult to make it visible, just like how SNR is usually a line about a black film or whatever unless it's the anti-finisher. We'll leap from one problem to another. The active effect may be the reduction in effects needing LQ, but it's not as eye-catching or narratively visible as a total removal of negative environmental effects, like it does for Grounding. That'll probably help with more narrative engagement, imo.
For example, if Ling Qi was mediating between Xia Ren and the Weeping Willow, Grounding completely removes their passive effects on lower ranks (like the feeling of a knife on your skin) instead of a reduction. Then we don't have to spend time maintaining it, and can do our political and mediation stuff.
And lastly, well, both Dispersion and Grounding talk about understanding, but Grounding asserts that you can try and understand two different things by looking at their connections, the points where they intersect and resemble each other. I think that also fits the idea of Multitude. Everything is different, hut some things are similar enough that you can apply different concepts to them and all.
That feels very Ling Qi to me compared to "you have to touch me for me to understand". Ling Qi is no longer ignorant. She seeks knowledge and understanding, and I think this best reflects that.
[X] Grounding, Through and out, world and spirit are one, understand and stand tall. (Bastion's negation may apply to more targets, and linger even without your maintaining attention.)