Soloists with official debut and promotions but still in their groups. From what I remember:
Mamamoo (4/4) - Solar, Moonbyul, Wheein, Hwasa
Blackpink (2/4) - Jennie, Rosé
Red Velvet (2/5) - Wendy, Joy
(G)I-DLE (2/6) - Soyeon, Yuqi
Oh My Girl (1/7) - YooA
Mamamoo all released solo albums and 2 members already had concerts. Soon Blackpink will also be all soloists. Probably RV too unless Irene & Seulgi just stay as a sub-unit. Which other groups can complete their line-up?
Also why are companies balancing solo and group activities more now compared to previous gens? Idols only used to start solo careers near/after disbandment.