I don't see a reason why a trainer cannot be created since people are willing to spend their RC on it. Each RC has a monetary value and a time sink for the devs associated with it. If folks want to spend their RC on it in order to let them enjoy the gameplay the way they want it, let them. I for one put some in because I'd like to see an option to add extra attribute points to put into character attributes, and more engram points since at max level you won't get enough points to have all engrams.
Pretty much everything else you can do with SP console commands except those two options.
They have hundreds of other trainers to update. If this one has proven to be too hard to train and or it has console commands that make a trainer mostly or entirely obsolete they typically will avoid making a trainer.