I think “IDE doesn’t support it yet, therefore we can never have it” might be a bit of an unreasonable argument.
As the current implementation exists, it requires an @experimental language feature import, so is not even usable without nightly/snapshot compiler, and it probably wouldn’t become stabilised (even with SIP approval) until IDEs, linters etc can support it.
The primary use case as mentioned is for some form of container with typed field selection that can be easily constructed by macros. E.g. parsing some schema into a data structure, or dataframe-like APIs - macros are not allowed to generate classes where the API is not already defined e.g. in a trait. However they would be able to construct named tuples. Other libraries already exist to do a similar thing with structural types, but these are not integrated as well with the compiler, and need to reinvent the wheel to be flexible.