adding a 2 factor verification method needs a lot of time and coding. they've already did a lot of work implementing google 2FA and it is not been so long. I don't think Forum Admins would like to add another one or change current Google 2 Factor into Aegis
The forum does not need to change anything since any totp app works. Aegis and Google authenticator are both totp app hence both should work.
I prefer Google 2FA, every website and application I know use google 2fa. it sounds more authentic than a relatively unkown company. BTW I had never heard of Aegis before. it looks like it has been around for quite a few years. but still, I didn't see any website or apps using their 2fa.
Platforms typically mention google authenticator but this doesn't mean only google auth works. I believe, I've also listed why aegis is a lot better than google auth but I just wanna say that they're not:
1. relatively unknown - if you look up on online communites such reddit, it actually been recommeded a lot particularly on privacy and security focused communities, and even on bitcointalk by prominent members. also see their github:
https://github.com/beemdevelopment/Aegis2. nor a company - just some fellas doing god's work at no cost