I would imagine that it will be used pretty generally, even beyond just gearing alts.
I think particularly there can be a bottleneck for slivers from t1-t3, since you can only do quests to get faction points, you are killing far fewer mobs and can be quite short of the required amount of slivers to upgrade 4-5 dg pieces. Especially if you are a tank/support toon and can’t easily kill mobs.
From t3-t5 it kinda becomes the opposite. You kill so many mobs to get faction points that you often end up with a surplus of shards, which end up being useless since they are not tradable.
Of course an alternative solution would be to just make normal slivers tradable. But assuming there was a reason that masterless/dispossessed are tradable and normal ones aren’t, this would at least allow for some sort of trade off that wouldn’t be too powerful but still allows us to make use of excess normal slivers.