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deleted
Airhead
I don't generally paint freshly plastered walls but I'm not usually working on or in building sites. So to answer the question it's normal for me to paint walls where the plaster has been drying for anywhere between 1 and 100 years. In my own places I leave the plaster to dry for 6 months before painting so yes I've painted some fresh fully dried plaster.
I've scraped a lot of paint from walls that were painted too quickly though. It usually comes off very easily. You get used to the look of the plaster underneath and the paint usually has plaster dust on the wall side.
Over the last 20 years the building game has been cutting corners so badly, if you don't know what you are looking for it only bothers you when you want to correct it. It's not an opinion though, it's the science of plaster, it'a a crystal that is forming the surface for many months after it's touch dry and paint doesn't bond properly to it until that surface formed. Of course 6 months is only a rough rule of thumb.
I know it seems odd that someone in the trade would refuse to do a job when you see it's being done all the time but in my case it does happen or I find another way to do it that works within the parameters the client has. Sometimes that could be lining a wall that has been recently plastered. I still don't like to do it and it's very hard to convince me that you can't live with a plaster wall while it drys as it's not that big an ask.
I don't work on new builds they are usually painted by teams but some of the most recent new builds use different techniques, a lot of European builders have never skimmed plasterboard, they tape and fill the joints with the equivalent of easifill and paint that.
Builders will paint anything without question and usually with one type of paint, a lot of them don't even see painting as a speciality. My work doesn't bring me into conflict with them for which I'm thankful. They wouldn't want me snagging their work but most of them are not too worried, painting is just a pain in the ass job that has to be done once the important stuff is finished. :)