[consteval]

I think the biggest problem that can come of it is lack of standards.

Each dev has their own way of writing things, their own little language. To them it is perfect. And it all works, passes tests. But, if you let them do this then your code becomes sloppy. Styles go in and out. Like reading a book where every other paragraph is written by a different person, and none of them talked to each other. Sometimes you get PascalCase, sometimes camel_case, sometimes snakeCase. Sometimes booleans are real bools, sometimes they're "Y" "N" (yes, real) or sometimes they're ints. Sometimes functions take in a lot of arguments, sometimes they take in a struct with options. Sometimes missing data is nullable, other times it's an empty string, othertimes its "N/A". And on and on.

You can enforce a lot of this through automatic linters, but not all. You require a set standard and the PR procedure can enforce the standard.