my 5 yo gets up by himself every morning but he comes into our room and snuggles with me. I wont get up before 630 and he knows that now so he can snuggle until then and if he gets up earlier, he has coloring/books/stuffies in his room to play with, and he can pee/get dressed/brush his teeth by himself if he wants.
Dad is an earlier riser- before 545 so on weekends they get up together. We also rotate sleeping in on the weekends although my DHs version of sleeping in is 730/8am and then watching the news for an hour whereas I can sleep until 11am still.
We do not allow our son to eat or be downstairs solo. If we are both feeling lazy or ill, we have a TV in our room and we've previously let him go get snacks from his snack drawer and watch TV in our room until one of us is feeling better/alive.
He would absolutely open the door and take the dog for a walk or go outside and play or if our neighbor was out go out the garage and say hi left to his own devices. He's an extroverted morning person

so we had to enforce not being solo in the morning.