I agree there is an issue. I don’t agree about what the issue is.

The problem is not Unicode rendering. The problem is improperly mingling information of a different nature. File extensions are not a good way to tell you if a file will be executed (Unix got that right from the start). Then executing a file involuntary shouldn’t lead to significant risks for your data and your system. That’s the actual problem which needs to be solved. Mangling text rendering is not the solution.