I used to think the same, until I read somewhere that our brain is pretty much the size of our two fists if we put them palm-to-palm. Looking at my own hands that way is a great reminder.
You can. Reddit will let you request a dump of your data. It's what I'm doing on my 11 yr old account, and once I have that for my own archives I'll nuke the account.
Bitwarden, all the way. On my mobile devices, laptops, etc.
I used to use KeePass but the UI is so antiquated and features also just haven't kept up. Bitwarden free, open source, audited, syncs and works everywhere flawlessly, and I can self host if I ever want to. It's great.
Very good point - the paid version is cheap and well worth it.