It would be cool to have group content for less than 4 people

[AnnaUK]

They have island expeditions in the current expansion that are 3 man v AI or 3v3 pvp while still trying to collected the most resources.

They had scenarios that were 3 man in Mists of Pandaria.

[Gula]

Would be cool. Solo duty AI has only improved which is basically 2 man content. Just add player.

And I agree it should be side content only.

[Ceridwenae]

I play with my daughter sometimes and I would love it if we could do a trust dungeon together and fill the 2 remaining slots with the npcs.

Same! Also we run stuff with my husband sometimes, too. Although running old stuff unsynced also meets this requirement, it's not the challenge it should be and it would be nice to have more recent content adaptable to smaller groups (or, perish the thought, all the dungeon content in the game).

[Tracewood]

They could take what they have for the Masked Carnivale, but make it low man content, and fill in vacant slots with Squadron/Trusts

Like the Colosseum from FF7/FF7R where it's basically floors of mini boss fights until the main boss. So you have that option to run with friends or with Ai. If they really wanted to, they could add a "Chaos" mode where you could get gear that rivals Savage in item level once a week, but the challenge would be ramped up.

They did showcase for the Bozja content you can go 1v1 in a Savage/Ultimate style fight against a large enemy... could be a testing ground for content by seeing how well it's received.