The influence of these solo activities is actually very big for these idols' careers especially for gg. I think we've all noticed how Blackpink is frequently on hiatus as a group but they're very active individually and all of them are the ambassador for luxury brands. This allows them to always present in public's eyes and as the result, it creates brand trust between Blinks and Gp towards Bp because of this very strong branding they have. Therefore, their fans are so loyal and Gp who always see them through cfs and so on are still very interested in them. I think Yg is very smart when they let Bp have their individual activities quite early in their career especially compared to other 3rd gen groups. You can see how much influence they have individually and as a group now. Something that is very difficult to achieve.
I think Hybe is aware of this and let their gg to do individual activities this early to strengthen their gg position in this bloodbath competition. Amost all Lsf and Nj members have their own individual deals. Starship as we all can see definitely slowly going to this direction too with Ive. What I don't understand is,why Sm and Jyp don't seem interested in using this marketing method with Itzy, Aespa and Nmixx?