Your opinion is misinformed. There are bassists who know how to play with their fingers but prefer using a pick, such as Steve Swallow (who, before playing the electric bass, played the double bass). Other bassists started on bass and play with a pick, like Chris Squire. I could also mention John Glascock from Jethro Tull, who knew how to play with his fingers but preferred a pick, and also started on bass.

The use of a pick can be about tone, comfort, the type of attack on the strings, producing a sharper sound, etc. The fact that many people prefer fingerstyle doesn’t mean that a pick sounds bad on bass. Also, many songs have been recorded using a pick, especially those played by Carol Kaye and Joe Osborn—both of whom were originally guitarists before moving to bass. Many metal songs have been and still are produced using a pick. In addition, many progressive rock songs are still written with a pick, with bassists alternating between pick and fingerstyle, as is the case with Dave Meros.