How could we expect the promoted team to perform greatly in EPL?
I also predict that Burnley and Sheffield United will stay. As for Luton Town as it is their debut in EPL I think it will be difficult for them to survive. Maybe they can gain experience playing in the highest caste in the League and will mentally shape themselves to be promoted again.
It doesn't seem to be something strange anymore when the promotion team can't play well, and or can't get good results in the Premier League. Because anyway, cases like this also at least happen almost in all major leagues in Europe so yes, I think it remains a natural result when the promotion team cannot play well here. But even so, at least with the promotion team can stay in the Premier League longer or not quickly relegated back. Then of course, with them being able to last longer here of course it has been a big achievement for them.