Why doesn't this community use the official AroAce Sunset flag?

In case you aren't aware there is an official AroAce 'Sunset' flag, we were wondering why it's not used for this community.

This is the flag:

Image description: The Aro Ace Sunset Flag created by aroaesflags on tumbr. It has 5 stripes. The top is Orange, followed by Yellow, then White, then Light Blue and finally Dark Blue.

More information can be found here: https://lgbtqia.fandom.com/Aromantic_asexual#Flag