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Generative AI creates playable version of Doom game with no code
(www.newscientist.com)
This is a most excellent place for technology news and articles.
Both of these engines are capable of making very optimized games, it’s just that most of the developers using them either don’t have the expertise or don’t care to put in the effort.
I know. The inherent problem of games made with those engines is the lack of motivation, knowledge and experience of devs to make (programmatically) good games. Only very few games using those engines are good in that sense, and as exceptions confirm a rule I'd just simplify it to that statement.