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The evolutionary advantage of getting rid of non-coding regions is that there would be less DNA required to be produced for every cell division, and thus less energy required for every cell division.But, a mechanism to recognize a non-coding region, and splice it out (or splice something else in) would be extremely complex.
Yikes, settle down! He was just making a (valid) point.Not all organisms achieve the same objective the same way. Some organisms may well be polyploid, whilst others aren't. There are evidently advantages and downsides to both. Bacteria tend not to have many introns, if any at all. This is quite possibly for the reason that CliffordK pointed out -- there's simply no need to process more genetic information than is strictly necessary. If there's an advantage to be gained that outweighs the downside of wasting energy and time replicating extra material then that's going to take priority.