i agree with what you’re saying. i love bp but they definitely are there for an image, carefully curated by their lead producer/creative director, teddy. keep in mind, teddy was also the lead producer for 2ne1 and CL only started writing songs for the group in 2014, 5 years after they debuted. i think it’s just a mixture of the girls needing to grow and develop their writing skills and them wanting to produce, because all of them were likely trained to be better at the main idol things (sing, rap, dance, idol personality) other than songwriting.
but at the rate the girls are busy doing other individual modeling projects, i feel like it might be a while, unfortunately. 
