I must admit that I'm still a bit confused… perhaps confused isn't the word here.
The portal market has quite a number of players with solid solutions based on standards like JSR-168. I see Share as being, essentially, a portal product in that it has the same basic must-have feature set as what you would get out of something like Liferay or a commercial offering. The difference of course, unless I'm completely mistaken, is that Alfresco has chosen their own implementation.
Right now as I am comparing products and have narrowed it down to Alfresco and Liferay, I must say that the basic features I need are available in both. However, I do need the advanced features of Alfresco document management for certain types of documents. If I choose Share then I have to wait until the more advanced features are added or use multiple clients, and if I develop any custom applications in Alfresco then I'm tying myself to Alfresco. If I choose Liferay then I get the same basic features as Alfresco, including the basic document management features, and many more that I might be able to take advantage of. If I develop custom applications for Liferay then without a terrible amount of work I can always move them to a different JSR portal in the future and I'm not locked in.
Without any sarcasm or ill-intent, can you explain why I would choose Alfresco Share instead of a portal based on standards? Why did Alfresco choose to take its own direction instead of working on portal integration? Does Alfresco have any plans to increase portlet support other than providing APIs that we can use to do it ourselves?