I think you would find that even the older Nomex gear was just as subseptable to harm from UV, but since Lion Apparel are guaranteeing performance of the new PBI gear, they are really trying to make sure the gear is looked after EXACTLY how they want.
When we got our gear, they did look into UV cutout on the stations perspex and glass windows, to ensure minimal exposure.
As for bunking overpants, we still do to certain degree, but they are held up higher on the wall by a hook.
Personally, I think we are all lucky to have such good PPE gear, because Fire Services in other states are still way behind!