As of Windows 10 1903 you can set the codepage of the application to UTF-8 - in fact for UWP Microsoft recommends you do that (https://docs.microsoft.com/en-us/windows/uwp/design/globaliz...).

Unfortunately I don't see that being common enough for data ingestion tools for this to be relevant for a very, very long time.

For now, it's just another pain point because you can't assume Windows == UTF-16 lookalike anymore.