I did this for years too until mobile devices became popular. I have ~4 mobile phones for various things (yes this isn't normal) and ~4 different computers/laptops I use. Trying to keep a Keypass in sync between them is a nightmare. A proper password manager (Bitwarden or other) removes all that hassle. I have fingerprint unlock on the the mobiles that support fingerprint, face unlock on the devices that support that etc. I have browser addons to make password entry quick and easy while remaining secure.
Once I moved to a password manager I realised how clunky and poor dragging a Keypass vault around was.
But it's not that though. They're hosting an encrypted version that they don't have the keys for. They are doing the backend sync for you, and writing the clients that YOU run, that sync yuur passwords everywhere.
To suggest they have a copy of your passwords is to misunderstand what they're doing. It's the same as saying you host your Keypass on Dropbox so now Dropbox have a copy of your passwords/secrets.
The value they are providing is seamless sync between a huge range of platforms/devices and making it as frictionless as possible to entry your password when you need to (biometrics to unlock the vault, browser addons to seemlessly enter the passwords etc)
Your Dad has a single point of failure for all his accounts. That's not a win.
I love Bitwarden and use it every day, but I pretty much also agree with his post. I have Bitwarden for personal stuff and 1password for my, and the 1password experience is night and day better. It's just so good, it always works. Bitwarden sometimes (especially on Android) will just not autofill. On my PC sometimes it won't recognise the domain correctly even though I've got an entry set for "base domain" etc. I am ALWAYS fighting with it to get my passwords out. Look at the Bitwarden Reddit its full of similar complaints.
Of course the price between 1pass and Bitwarden reflects why 1pass is so much better. And you don't really realise how clunky BitWarden is if it's all you use, until you also have to use some other password manager.
And I could tell you the opposite about 1Password. About half of the time, the extension does not realize ond which domain it is and autofill is broken.
Not the original commenter. Just thought I would comment here. I'd be super interested in reading more information in why Bitwarden Lite is inadequate vs vaultwarden.
I know what you mean though, I use it but it’s never quite right. Hard to say exactly why.