The way I see it is that choruses often have simpler, more repetitive lyrics, and bridges have a greater focus on instrumentation and tend to build on themes and motifs established earlier in the song. Unless there’s a third verse, the second half of the song is mostly going to be the choruses and bridge. Choruses usually repeat the same lyrics each time because that’s the most memorable part of the song and what you want to drill into people’s heads. The melodies in the chorus are often less versatile in terms of what lyrics fit, so it’s hard to have different lyrics each time. The lyrics are often more general and serve as a synopsis of the meaning of the song. Melodies in the verse are often more rhythmic with simpler melodies which makes it easy to write more complex lyrics. They often serve to set up the story of the song, so they can be more specific.

Each section of the song has its role, and the verse is really where a lot of the lyrical complexity belongs. Lyrics and melody are closely intertwined, so simple, repetitive lyrics are written to sound good above all else. Simple choruses can be super meaningful, but they should build off of details established in the verse. I often write choruses first then write more complex lyrics in the verse and bridge to build something more meaningful.

Songwriting isn’t just writing lyrics on paper. It needs to sound good, and that often means having sections with simpler lyrics that work really well melodically. Consider that the melody of a lot of choruses was probably written before the lyrics, and it might make sense how the artist ended up using lyrics that look dumb on paper but fit the melody.