Thoughts on 'CUSTOMIZATION'

While working for a project during my internship I came across this difficult aspect of softwares...called the 'Customizability'...

So when we allow users to customize the UI...then...the design moves in difficult waters...'How to control the UI consistency?' ; nobody asks the user 'How much customization you need?' or 'Are you not lost in customizing the UI?' or the golden question 'Is it making your life simple???'

Some thoughts on customization...

The major problem in customization is that the designer looses control over UI. But still it’s a designers responsibility to ensure that user do not make their page un-user-friendly. Again just because it is customizable does not mean that the product (default design) should be badly designed. The default design should be a benchmark for user in usability readability and design. They should customize their page with reference from the default design.