Software that is not robust typically:
- is more likely to be damaged from an environmental threat.
- leads to an increased risk of hacking.
- leads to a poor user experience.
From the options listed, choosing one that encapsulates the primary concern, "leads to a poor user experience" is often a key consequence of non-robust software. However, all of the points can be valid depending on the specific context of the software in question. If you need to select one, I would recommend "leads to a poor user experience," as it often has the most immediate impact on the software's usability and effectiveness.