IMHO, the kernel should have filesystem mount options to just reject path names that are non-UTF-8, and distros should default to those when creating new filesystems on new systems.

For >99.99% of usecases, file paths are textual data, and people do expect to view them as text. And it's high time that kernels should start enforcing that they act as text, because it constitutes a security vulnerability for a good deal of software while providing exceedingly low value.