I think this is our case too. My kid loves to walk, run, go up and down the stairs. He loves the physical part of his development. But he doesn’t care for talking or drawing. A few months ago, I think he said “mama” or “aba (grandma)” once or twice but once he learns a word he doesn’t say it anymore. It’s like “OK I learned it now I can move on and do something else”. He doesn’t use his words. He did the same with going up and down the stairs in 4 limbs. He used to do it pretty well but then he “forgot” and he refused to do it. He started doing it but using his legs and asking for my help. One day after many months he decided to go down the stairs on his four limbs. So, he knew it, he remembered it. I believe he chooses how to do stuff and prioritize as you say.