Some of the retired companions are completely unique in their stats/synergies/abilities. With how important team composition is for numerous site activities, this can easily become an issue where the only companion who can fill the role you need is retired.
I'd like to see every retired companion have another available companion that exactly matches their combat abilities. While a recolor would be the least work intensive way to do this, they don't have to be visually similar if staff would prefer the retired companions remain unique looking. It's just the combat features that are strictly important.
I'd also be fine if the new companions were difficult to aquire, like the Kapros for example. Or if staff want to maintain the RL currency association, they could be a MS item. These new companions don't need to be easily accessible, they just need to be unretired so every concurrent player could hypothetically get one at any point in the game's future if they need it for their team.