There's the obvious fact that they have 5 members but there's other stuff too.
- Both debuted with young members, the oldest in newjeans and txt were 18 and 19 and the youngest were 14 and 16, so they're very young groups.
- Both debuted with what was considered a fresh concept compared to other releases at the time - crown with it's youthful pop sound and attention with it's youthful and fresh rnb sound
- Both had mvs for every song in their albums
- Both were called bland or uninteresting by kpop fans for their visuals/voices/ skills/personality
- Beef with multiple fandoms at debut
- The whole "All moas/ newjeans fans are army"
- A song from their debut album rivaling another main track - cat & dog vs crown, hype boy vs attention
- A song people find weird for the lyrics (for different reasons though) - cookie and cat & dog
- Not entirely rap focused
- No members known predebut
Maybe I like newjeans so much because they remind me of a debut txt, both of their debut albums give me the same sense of comfort
Let me know if there are other things I missed out