What if... we had the "best" parts of PHP or JavaScript development but for any traditionally statically-typed and precompiled language?
(sorry, I can't say that with a straight-face)
It could work though! And I don't just mean like Visual Studio's Edit-and-Continue feature...
Consider a language feature that lets you annotate a local/parameter/field's ("thing") type as "Hindley–Milner-esque" which tells the compiler to invert the thing's typing rules from prescriptive to descriptive (i.e. to mostly stop complaining and make the thing behave more like a JavaScript `object`, so the compiler only complains about 100% provably wrong usage of that thing).
Another "feature" of PHP/JS dev that I want to see in compiled projects is a way to run a project-with--build-errors by adding a toggle that instructs the compiler to stub-out all functions/members that contain build errors (even syntax errors!), this way we can do quick ad-hoc testing without needing the entire project to build. Think about the times when you your boss asks you to make 1 or 2 "minor" alterations for an unrelated feature and you don't think it's worth making a whole new git branch-andworktree for, but you can't test it right-away because of unrelated breaking changes you've already made.
Just some ideas...
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Unrelated additional comment: I'm looking forward to when all programming languages fully support generalized ADTs. So many issues with data-modelling can be solved with ADTs and GADTs, but yet thanks to OOP's legacy from the 1990s we still have to shoehorn simple and clear models into inappropriate applications of inheritance. I want my intersection-types, damnit.