You sort of point this out, but title inflation in itself isn't a problem. If everyone could agree that "senior staff developer" in 2021 is what everyone meant by "senior developer" in 2005, we'd be fine.

The real problem, as you point out, is there is no consistency. In reviewing resumes basically ignore titles from any company I'm not very familiar with, and rely on their description of what they have done.

As an aside, many engineers, especially less experienced ones, are terrible at this. As a piece of advice, think about what your resume says about your work if the titles are blacked out.