A self-hosted password manager works for me; I only ever log in with a password from a single machine, so I use a local password manager that is completely unintersted in networks. I don't use a plaintext file, because like most people I have secrets; and because I trust people, not bureacracies (so I don't trust either the police or the government to hold my secrets safely).

That isn't going to work for most people, obviously. Most people want to be able to use their credentials from arbitrary machines. I don't have that requirement.

Mental work vs. physical work, pick your poison. Self-hosted password managers aren't work-free, you have to set them up and get them working across all your devices and maintain them.

When I need to log into Nintendo's eShop from my Switch, I use my algorithm. How does that work for a self-hosted super long random Bitwarden password? I'm guessing I need to bring up the password on my phone or something and manually copy and compare it digit by digit into the Switch which sounds like a lot of work.