I disagree on merging Sheltron and Intervention nor Cover, and here is why:

Having multiple actions targeting an ally, and at least one of them having a "on yourself" or "on party member" effect, may cause the wrong effect to trigger when using another in succession. i.e. if you want to cover your partner, and Sheltron on yourself, it will end up being cover + intervention which is then wasted!

Ofc this issue doesn't affect other tanks because they only have 1 ability each that can target allies: WAR-Nascent Flash, DRK-TBN, GNB-Heart of Stone. Warriors Nascent Flash CAN also be targeted on self, but the effect is the same if you target an ally. Nevertheless, should your "tethered partner" die during Nascent Flash, both Nascent Glint and Nascent Flash effects will be lost, but I guess this is just a programming problem, intended or not.