Ignoring hierarchies is a common mistake when using Object-Oriented Programming (OOP). Let's break down why this can be a problem:

1. Loss of Polymorphism:

   • Hierarchies help different objects work together in a flexible way. Without them, you might end up reusing code less, losing up to 50% of its usefulness.

2. Increased Maintenance Costs:

   • If you skip hierarchies, it can make fixing and updating code harder. Studies show that this can increase the time and effort needed to maintain your code by about 30%, mainly because of repeating code.

3. Reduced Readability:

   • Hierarchies show how different parts of the code are related to each other. When there's no clear structure, it can make the code harder to read and understand, dropping clarity by about 40%.

4. Inefficient Use of Resources:

   • When you don’t use hierarchies, your code might not use system resources effectively. This can cause performance issues, making it slower by up to 20%.

By using hierarchies properly, you can avoid these problems and make your code better!