There is nothing wrong with upgrading. I think the poster's message, though, is if you are getting a new bike - it should be properly outfitted out the door. My point here is that some things - regardless how nice it is out the door - will beg attention/upgrading/changing. Such as a saddle. Everyone's backsides are different. So a new saddle may be required. Or a change of the stem-height and/or angles. So forth.

This isn't like buying a new hybrid-bike with the thought of turning it into a road-bike. This would be a frustrating, if not ludicrous, proposition.

The Raleighs look great - and the reviews in here certainly bear this out in reality. Once again - thanks for bringing them to our attention!