The main problem for the Vorcha is their short lifespan. Educating and training them would take up almost their entire life, so what use is a highly trained specialist if he dies within the year of his graduation?
BioWare also has never been clear about the Vorcha's fabled adaption to hostile environments. They can do this metamorphosis only once, then they are stuck in that form. If they adapt to live on a Volus world, then they are stuck there until someone makes them a pressure suit.
If that change isn't inherited by their offspring, then it's pretty much pointless, too.
If the Vorcha retained their knowledge over generations or if they wouldn't devolve back if left alone, then they would quickly become unstoppable. Throw a sufficiently large number of them at a problem and they'll solve it in record time. Similiar to crowd-sourcing scientific problems in RL.
Give them a weapon and tell them to develop a better one... and within months they'll pilot Gundams. They can experiment without limits... so what if some of them die horribly in massive explosions? The rest learns from it and does better... and since they continuously replenish their numbers and bring the newcomers up to speed, they collectively get better and better.
Well. If only they worked that way.