Usually, no—neither a dry cabinet nor a dry box is strictly necessary for most point-and-shoot or DSLR cameras in normal home conditions. The need mostly depends on your climate and how long the gear will sit unused.

If you live in a very humid environment, especially tropical conditions, added humidity control can be helpful to reduce the risk of moisture-related issues. For typical climates, many photographers store cameras and lenses normally without problems, even when humidity changes through the year.

For long-term storage, a simple approach often works well: keep the camera in its box or another closed container with silica gel packs. Replace or recharge the silica gel when it indicates it has absorbed too much moisture.

So, for both a point-and-shoot and a DSLR: a dry cabinet is more of a precaution than a necessity unless you have consistently high humidity or store gear for long periods.