Such a person would probably not buy the TSU9600 in the first place but instead go for something cheaper. However for persons that would like to go down that route they would be forced to buy extenders to all their equipment. So Philips would still be happy because they would have taken a potential customer from some else. (Do remember that just the simplest extender cost just as much as most other remotes.)

What it would do is to enable installers even more freedom like allowing their customers to control their gear from the web or any other place and not just the TSU9600. Like a control panel on the wall. Another thing they would gain is an option to help track problems. Say your extender doesn't seem to be working. Using this you could then send an IR code directly to the extender to test it and by doing that skip the "Can the TSU9600 even send the signal onto the network" question.

So installers gain freedom, more options and thus happier customers.
Philips takes potential customers from competitors by essential offering a 'cheaper entry system'. ie Just buy an extender and you good to go. Get the TSU9600 when you get more money and want it to not just work well but look good to =)