I do store all my aliases into a local Keepass yes.
I never forget my Master password, hence nothing circular and nobody knows my real email.
I myself tend to forget the exact address 
because of how rarely I need to re-login into my main email inbox.
Only issue I faced so far is when I’m in a dead zone with no public WiFi.
I do not use 5G, hence I cannot create an alias if no Internet and sometimes it’s problematic if I do not have one ready ahead of time.
But yes, I do not trust anybody to hold my data safe and sound.
Hence rather not spread it more than needed and leave everybody with an alias.
Quite unrelated but for family, I recommend Addy and its way to easily broadcast an alias to forward it to X mailboxes easily. Works great if you don’t want to share/forward an email all the time but have:
- movies ticket, forwarded to the brother + sister + mother
- taxes, forwarded to the dad + mom
- Steam, forwarded to the brother + sister
- want to make a surprise gift to your family on the shared alias account?, forward it to yourself only and write a sneaky description like “garbage tax”, nobody will come and ask what it’s for
Makes it very streamline and cool to use (all of that while using aliases only).
Was hacky and quite hard to achieve with SimpleLogin…hence was a deal breaker.