RawTherapee is useful when photo work begins before the image becomes a finished file. If you shoot in RAW and care about exposure recovery, color balance, detail, and controlled output, a dedicated RAW processor gives you much more room to shape the result than a basic viewer or lightweight editor ever will.
It is most suitable for photographers, hobbyists with serious cameras, and image-focused users who want detailed development control on Windows. If your workflow involves reviewing photos carefully and making deliberate adjustments before export, RawTherapee fits that task far better than tools that only aim for quick filters.
What makes it worth keeping is control without destructive editing. The software is designed around image development choices rather than casual retouching, which matters when you want to preserve source quality and revisit adjustments later. That makes it especially useful for people who care about learning what their photo edits are actually doing.
The tradeoff is that it asks more from the user. A deeper processing tool means more sliders, more concepts, and less instant gratification. The better expectation is not speed at all costs, but a more thoughtful workflow for files that deserve it. In that role, RawTherapee becomes a strong Windows option for serious photo development.