It is, arguably, important to understand the needs of diverse students so that you can tailor your teaching to meet their needs. There are many people who believe that it is best to try to understand the needs of various kinds of students rather than trying to teach all students in the same way.
It is possible that diverse students will have different needs. It may be that they will not respond to standard instruction in the same way that “mainstream” students do. (However, we must be careful when making such statements because not all students who appear to be “diverse” actually have the same needs as others from their particular ethnic or other group.) Therefore, it will be important to understand what their needs are.
If you understand what they need, you will be able to teach them in ways that are more likely to get through to them. For example, if a student is from a culture that teaches them to keep quiet and submit to authority, you might not want to call on the student very much. It might make them uncomfortable to be made to speak instead of listening to you.
Because diverse students can have different cultural needs, it is important to understand those needs so that you can adjust your teaching style as needed.