Should Irish rugby encourage more loan moves like Harry Byrne’s?

Harry Byrne recently caused a bit of a shock by moving from Leinster to Bristol on a short term loan. On paper, the move makes sense, given Byrne’s lack of game time in the 10 shirt. But why don’t we see more players taking short term punts with a view to returning home an improved player? Should game time not be the primary concern? Have players become too comfortable being squad players in their home environment? W