They sleep through the night
Or they go to sleep just as you need to get up for work, and then sleep all day, waking up in time to ask you what's for dinner when you get home.
They can perform self care (washing, toileting, brushing their teeth, dressing, going to the hairdresser, using a washing machine)
In an ideal world, yes. But I know of many who struggle with this.
They can have a two way conversation with a peer or superior
Yes, depending on their mood.
They can read, write, tell the time, use a mobile phone
They can certainly use mobile phones.
Many of them can bake and cook
Then can usefully set fire to the kitchen while drunk.
They can be left in a house alone
Unless they decide to have a party for 400 "close friends".
can use public transport to get to where they want
Unless their legs suddenly stop working and they will miss the most urgent thing, ever, if you don't give them a lift.
The older ones can hold down a job
Unless they decide they cba/have mental health problems which mean they can't possibly do that.
As I said, everyone's experience is different.
I do honestly think that any parent is lucky if they get through every single stage unscathed, and if they enjoy each phase of parenting equally.