It cleaned the script up, but it unfortunately made Rena into a 10 year old girl
But but but... Nedians
can live a long time... maybe they age really slowly.
(That's the best I can come up with)
Seriously, we all know why they did it.
I'm not a big fan of it but at least they retained the essence of the character as opposed to Celine's redesign in Blue Sphere... I can't ever acknowledge that one.