I found the comment on 1Password quite interesting and tried to gather the current state of options that other password managers offer:
| 1Password | PBKDF2-HMAC-SHA256 |
| Dashlane | Argon2d , PBKDF2 |
| GnomeKeyring | PBKDF2 planned, but not implemented |
| LastPass | PBKDF2 with SHA-256 |
| Keepass | AES-KDF, Argon2 |
| KeePassXC | AES-KDF, Argon2 |
| Password Safe | PBKDF2 with SHA-256 |
So, Bitwarden supporting “only” PBKDF2 SHA-256 appears to be quite reasonable by comparison.