SumatraPDF stays valuable because many people do not need a document platform when all they want is to open a file and read it quickly. Manuals, PDFs, eBooks, reference notes, and saved documents often become more annoying than they should be when the reader itself feels heavy or slow.
It is especially suitable for users who read technical PDFs, reports, manuals, study material, or mixed document formats on Windows and want a fast, low-friction desktop reader. If the job is primarily viewing rather than editing, SumatraPDF is often a calmer choice than larger document suites.
What makes it worth keeping is lightness with practical usefulness. It opens quickly, supports several reading formats, and gets out of the way, which is exactly what many users want from a reader they may open dozens of times a day.
The tradeoff is that SumatraPDF is not trying to be a full PDF editing or annotation environment. Users who need form-heavy workflows, collaboration, or advanced markup should lower that expectation before installing. It is strongest when judged as a fast reader, not as a document office suite.
My recommendation is to install SumatraPDF if opening documents quickly matters more to you than advanced editing features. Keep it as a reader for PDFs and similar formats, and let heavier tools handle the cases that truly need them.
