Actually, a better question would be: why is caring about your architecture important? As we mentioned earlier, regardless of whether you put conscious effort into building it or not, you will end up with some kind of architecture. If after several months or even years of development you still want your software to retain its qualities, you need to take some steps earlier in the process. If you won't think about your architecture, chances are it won't ever present the required qualities.
So, in order for your product to meet the business requirements and attributes such as performance, maintainability, scalability, or others, you need to take care of its architecture, and it is best if you do it as early as you can in the process. Let's now discuss two things that each good architect wants to protect their projects from.