I can also find links that support my claim:
A Guide To Better Bass
http://www.theabsolutesound.com/articles/a-guide-to-better-bass-tas-197-1/
There’s one more technical difference between sealed and ported enclosures you should know about before we talk about the sonic characteristics of the two types—transient performance. A woofer in a sealed enclosure, when subject to a transient signal such a kick drum, will tend to stop moving immediately after the transient.
Conversely, a woofer in a vented enclosure will tend to keep moving after the drive signal has stopped, as shown in Fig.2.
The speaker with the sealed enclosure has more accurate dynamic performance.
So why would a loudspeaker designer choose reflex loading if the bass rolls off much more steeply?
Because reflex loading confers several advantages.
First, it increases a loudspeaker’s maximum acoustic output level—it will play louder.
Second, it can make a loudspeaker more sensitive—it needs less amplifier power to achieve the same volume.
Third, it can lower a loudspeaker’s cut-off frequency—the bass goes deeper. Note that these benefits are not available simultaneously; the acoustic gain provided by reflex loading can be used either to increase a loudspeaker’s sensitivity or to extend its cut-off frequency, but not both.
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I'll add that adding a sub-bass driver in a closed enclosure increases the cost and the size of the speaker, making it less atractive from a commercial point of view.
Three-way speakers are cheaper and smaller.
