I've also had university lecturers tell me that the worst thing you can do is create a brand new programming language. They see it all the time from PhD students and the world doesn't need more programming languages when the existing ones work perfectly well for the tasks they were built to address.
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the worst thing you can do is create a brand new programming language.
If your aim is profit, then sure. In an indie dev community there’s plenty of hobby developers that make all shorts of unusual projects for fun.
No point discouraging people that are looking to learn. Each person has their own motives.