Critical to becoming a good practitioner. You cannot seperate stance from sequence. Stacne unto itself teaches the structure. The kata sequence give them intelligent context, whispers hints of principles.
When the solo kata, its pieces are known understood well, you add bodies and increase resistance. Without kata you miss the long term; anyone not in ideal physical perfection.
Kata can be explored by anyone no matter what their conditions/challenges.
The time line has many possibilities solo technique, power, sequence and the cycle begins again. I can do it by myself, have learned to control the big stuff, now I explore my knowledge with another person, them slowly resisting. Explore that. Then another body, and another. See what factors exist between different bodies, temperments. Then return to the kata, the bag and improve explore how to generate power.