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You can use local ones like KeePassX.

There’s still good reasons. Mine is using public computers (library or school), or being able to use any computer at work in private browsing mode.

It’s also trivial to have passwords which are secure and easy to remember (literally off the top of my head): MyD0gb@rk$...

That is not a secure password. The phrase "mydogbarks" appears in several word lists and hashcat has had leetspeak rules for years now.

Hard to imagine what sort of exploit could come out that could cause havoc when the encrypted passwords are stored on your device.

Imagine a vulnerability in the password manager extension that allows a hacked site to fill in and scrape every login stored in the password manager.