They did not have to do it and free mp3 export was a frequent request. Moreover, they gave it to every Cakewalk DAW customer past and present.
Don't change the subject the challenge was name 5 user requested changes. There are many more but why should anyone bother since you fail to appreciate the improvements whatever the source. Out of synth audio recording came patch points and aux tracks. From a suggestion came plug-in upsampling. Also mix recall, more PC FX, improved plug-in layouts, more user control over the UI, cloning instrument tracks.... Feel free to refresh your memory
here, the associated knowledge base articles, supporting e-zines and Tech+Music publications. IIRC Tech+Music was user requested too.