It should - but not necessarily the same development players - Saxons should be for fringe and budding internationals, giving them a chance in a different environment from their standard; a chance at taking on board different ideas from different coaches, answerable to a different authority, and with different questions asked of them - essentially, can they step up to international level, and get used to a training camp away from home for several weeks.
On the one hand, you could take someone like Jordan Olowofela and take him out of his comfort zone, test him out with new coaches, different systems and team-mates he never met before the training camp; and see how he goes up against whoever's up and coming in Ireland or France.
On the other hand, you could take someone like Jordan Olowofela, and leave him in his comfort zone, with coaches, systems, team mates he's accustomed to; and see how he goes against whoever's up and coming in Nothampton (and that he's played against at academy level) or whoever's gnarled and experienced from Bedford trying to take a big scalp.
Not that I feel all that strongly about a Saxons level 6N competition, and would happily sacrifice that desire if we got summer tours and a proper competition for club development, spanning both Prem and Champ (I'm still annoyed that we completely pissed away the opportunity to do anything useful with the AWC once the Welsh left).