NAS products are equal parts hardware performance and software features. One compliments the other in a balanced product. You need more hardware performance to run more software features at the same time.
The software list is ridiculous. Looking over the list you can see QNAP through of everything and then some. This is just the base software list though and doesn't include all of the third party add-on packages.
As you can see, QNAP managed to move all of the add-on packages over to the new QTS 4.0 software and then added a few more.