It's not boring, it's identity. Which it seems far too many rugby teams disregard. Teams like Arsenal, Liverpool, Juventus and Real Madrid have built up iconic shirts that people know world over, a successful European rugby team like Leinster, Ospreys don't have that from changing it too much. Even the Scarlets despite their name, managed to inexplicably add brown chunks to their shirt one season. Cardiff Blues have changed their shade of blue every other season seemingly.
This should be the Welsh shirt for good. Just updated with new materials etc. No pointless white piping (thank goodness they don't have Canterbury making them) or imitations of the Arsenal shirt.