I love how we developers see ourselves like creative writers instead of plumbers
If you work for someone, you are essentially plumbing, you will still find faults with their ideas and inform them. But you don't make the call to change that idea, nor do you have the burden of living with the finished product. It doesn't have your name attached to it. No one will call it, siva7's crm, you will move on to the next project.
Now, if you are building something for yourself, you are the creative writer. It's your call, it's your want, it'll have your name attached to it. You can move on, but in everyone's mind and your own, it's your creation.