Several SMN actions missing from action list or have wrong/incomplete tooltips

[Rongway]

This is user error, not bad design

No. The schema established by the dev team is that for each unassignable action that replaces another button, one of two things is true:

A) The action's effects, potency, and cost can be read in the Action Help for the action it replaces, and the action it replaces is in the Action list (i.e., Earthly Star's Stellar Detonation)
or
B) The action is in the Actions list and includes its own Action Help that tells you its effects, potency, and cost (i.e., Gemshine's Ruby Rite)

Based on this established schema, users can reasonably expect that the spells listed in my post above should also have their effects, potencies, and costs viewable in either the Action Help for Gemshine/Brilliance or in their own Action Help that is available in the Actions list. Adding all fifteen actions to SMN's Action list would be a lot, and it may not be bad design to exclude them from the Action List. However, it is bad design not to include those actions' effects in the Action Helps for Gemshine and Precious Brilliance so that players who want to know their potencies are not under the burden of having to enter combat just to look up the numbers.

The current bad Action Helps for Gemshine and Precious Brilliance are as follows:

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deal fire damage to a single target
Earth Attunement effect: Deal earth damage to a single target
Wind Attunement effect: Deal wind damage to a single target

Channel the energies of your active elemental attunement to attack multiple targets.
Fire Attunement effect: Deal fire damage to a target and all enemies nearby it
Earth Attunement effect: Deal earth damage to a target and all enemies nearby it
Wind Attunement effect: Deal wind damage to a target and all enemies nearby it

The following suggested Action Helps which contain the potencies and cast times would be minimally informative for meeting player expectations based on the established schema:

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deals fire damage with a potency of 340. Cast time: 2.8s.

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deals fire damage with a potency of 340. Cast time: 2.8s.
Earth Attunement effect: Deals earth damage with a potency of 240. Cast time: 2.5s

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deals fire damage with a potency of 340. Cast time: 2.8s.
Earth Attunement effect: Deals earth damage with a potency of 240. Cast time: 2.5s
Wind Attunement effect: Deals wind damage with a potency of 160. Cast time: 1.5s

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deals fire damage with a potency of 380. Cast time: 2.8s.
Earth Attunement effect: Deals earth damage with a potency of 270. Cast time: 2.5s
Wind Attunement effect: Deals wind damage with a potency of 170. Cast time: 1.5s

Channel the energies of your active elemental attunement to attack your enemy.
Fire Attunement effect: Deals fire damage with a potency of 410. Cast time: 2.8s.
Earth Attunement effect: Deals earth damage with a potency of 300. Cast time: 2.5s
Wind Attunement effect: Deals wind damage with a potency of 180. Cast time: 1.5s

Channel the energies of your active elemental attunement to attack multiple targets.
Fire Attunement effect: Deals fire damage with a potency of 160 to target and all enemies nearby it. Cast time: 2.8s
Earth Attunement effect: Deals earth damage with a potency of 110 to target and all enemies nearby it. Cast time 2.5s
Wind Attunement effect: Deals wind damage with a potency of 70 to target and all enemies nearby it. Cast time: 1.5s

Channel the energies of your active elemental attunement to attack multiple targets.
Fire Attunement effect: Deals fire damage with a potency of 190 to target and all enemies nearby it. Cast time: 2.8s
Earth Attunement effect: Deals earth damage with a potency of 130 to target and all enemies nearby it. Cast time 2.5s
Wind Attunement effect: Deals wind damage with a potency of 90 to target and all enemies nearby it. Cast time: 1.5s

Even more detailed Action Helps would be more consistent with the style and format of the Action Helps for other actions in the game, for example:

Channel the energies of your active elemental attunement to attack your enemy. Action changes to Ruby Ruin III under the effect of Fire Attunement, Topaz Ruin III while under the effect of Earth Attunement, and Emerald Ruin III while under the effect of Wind Attunement.
Ruby Ruin III effect: Deals fire damage with a potency of 410.
Cast time: 2.8s.
Topaz Ruin III effect: Deals earth damage with a potency of 300.
Cast time: 2.5s
Emerald Ruin III effect: Deals wind damage with a potency of 180.
Cast time: 1.5s

However, just including the potencies and cast times as in the previous suggestions would be "enough".