I don't use 90% of the entries in my password manager on a monthly basis so anything that allows me to delay the password change on hundreds of accounts until I need to use the account again would be valuable.
at least this way they would have to prioritize
Bitwarden isn't much better, but they do have a cli technical users can cobble something together. (I ultimately decided to skip on Bitwarden also)
Time boxed to about 15 mins a day, it hasn't felt like too much of a burden. But also finding I can just delete quite a few, as my vault is over a decade old and many sites/services are now defunct
Will take another month or so, but have the more recent/crucial ones done already so worst case someone might crack my old digg password
I don't personally use Dashlane and cannot speak to its security.