In an ideal world yes - but in some situations its just not practical. For example, I once worked on a (large) project for a company I worked for where we were

In an ideal world yes - but in some situations its just not practical. For example, I once worked on a (large) project for a company I worked for where we were the customer and developers were out-sourced about four levels deep - they weren't even clear as to who the top level customer was let alone what the user journey was.