The MSQ is largely single player anyway, so I'd say go for it. Being able to clear the MSQ without other people is fine, imo. I honestly prefer to do the first run of a dungeon in ShB with trusts because it makes more narrative sense and I like to see their little dialog snippets and such.

The WOL is travelling with a capable group of characters, so of course they'll help. Extending this concept to MSQ trials just seems to make sense, honestly.

I wouldn't add it to ex fights, optional trials, and such though. Just the few MSQ ones we have per xpac.