Before you kill me hear me out first. So we all are aware Jennie has a weak constitution as it has been mentioned countless times. The reason she's been jobless for so long since the album was revealed to be due to her health concerns. Everyone thought it was yg ruining her opportunities when it was actually her and her team looking out for her wellbeing.
So what if the infamous hiatuses are not entirely because of misogyny but because of health issues they can't get around? One member is not strong enough to handle the stresses of constant comebacks hence the focus on solo promotions instead of coming back without a key member.
We all heard from her own mouth how difficult the tour was on her and how most of her time recently has been spent thinking of ways to keep herself in top form for the upcoming tour.
2018 - 2019 when she was the busiest was also the time she was at such a low point that even fans were noticing. The whole lazy scandal thing. She always looked down and there was that time she had to leave the stage abruptly in the middle of a song while looking like she was in pain. It all makes sense if you think about it.