What are the four drawbacks to telecommuting mentioned in the article?

The four most common drawbacks from telecommuting are the following:
1. Decreased human interaction: To be honest, telecommuning, even effective can decrease the human approach many of the clients and bosses want from the people. Sometimes they expect a service given by a person who is face to face and can understand them rather than a machine or a person who is unknown by them.
2. Blurring Work and Personal Life: This basically means that a person cannot separate his job form his personal life. As the worker can have his workplace at hand, many of them work many hours and turn to be workaholics
3. Difficulty Demonstrating Workload: This means your office coworkers might perceive you as doing less work simply because you’re at home.
4. Technology gets in the way: which means that  When your own Internet access gets weak, you can't get your work done and you loose credibility