Storing Drivers Licence: Was answered elsewhere. Bottom line… Bitwarden seems like it can store other types of data. Note that I don’t use Bitwarden yet, but have experience with Enpass and 1Pass, both of which can store all sorts of data.
Why separate storage if Bitwarden is E2EE? You are placing all your trust in a single organization - Bitwarden. If they get hacked, then it is possible for the hackers to poison their software to deliver master passwords (hacks of s/w repositories has happened). I prefer to separate encryption from storage so a hack in both is required to get my data. Note that I do the same for offsite backups to Glacier/S3. I use Arq to do the backup and encrypt the files, then send them to S3 for storage.
The 2023 IBM Report on Cost of Data Breeches indicated that the average time for a company to discover a breech is about 200 days, and on average another 70 days to remediate. That keeps me up at night in my day job as security dude.
Lastpass was hacked and might have lost control of some data https://blog.lastpass.com/posts/2022/12/notice-of-security-incident
1Pass hasn’t been hacked directly, but they were affected by the Okta https://blog.1password.com/okta-incident/
(One of the most common vectors for hacks is through your vendors - see Target https://krebsonsecurity.com/2014/02/target-hackers-broke-in-via-hvac-company/)
Dropbox had an unauthorized access, but the seemed on top of it. https://sign.dropbox.com/blog/a-recent-security-incident-involving-dropbox-sign
Dropbox also has had a more significant data breech, but a while ago. https://www.twingate.com/blog/tips/dropbox-data-breach#
Overview of all password manager breeches! https://bestreviews.net/which-password-managers-have-been-hacked/