What is true about copiable values influenced by copy effects?

The focus of this question is on the nature of copiable values when a copy effect is applied.

When a copy effect is initiated, it can create a copy of a permanent with certain characteristics. However, the characteristics that become part of the copied item can be influenced by the specifics of the copy effect itself. This means that, under certain circumstances, the values can indeed be restricted based on what the copy effect is designed to do. For example, a copy effect might specify that certain abilities or characteristics are not included, leading to variations from the original object.

Understanding this concept is crucial, as it reveals that the nature of copying in Magic: The Gathering is not a straightforward duplication but can vary depending on how the effect is applied. Consequently, while some values may remain the same, others can change or be different in a manner dictated by the copy effect's text. This brings clarity to why the values might be restricted based on these specific effects.