Aegis is no more secure than storing your TOTPs in your password manager - 2 factors primarily protect against remote attacks, which don't have direct access, in which case the app your 2nd factor lives in is moot. If your threat model involves direct access you need dedicated hardware for your 2nd factor. Most people are fine with TOTP in pw manager.

(I do use Aegis as I like the UX but that's a separate topic)