Obviously whoever was responsible for adding the "Check for Update" feature simply forgot (or is choosing not) to make use of it.
It is perfectly valid to ask the question "why is this being done." It is completely unfair (and unnecessary) to jump to conclusions about tracking usage over being useful. You guys are all guessing and making conclusions about guesses.
The developers are just a group of people. Sometimes mistakes get made, like, forgetting to update a text file on a web-server.