2)We have to consider the preferences of the people using the product and the needs for the product to work properly and efficiently. Basically the basic needs like a space for a laptop and a writing item is definitely needed. Other extra applications for the workplace could be items or improvements to make the work of the person easier, as shown in the video where the person is able to move his seat to a comfortable position.
3) These considerations are important because we need to meet the needs of the user for our product to be sellable. When people like our product, then people will buy it and we can earn money.