ZimbuTheMonkey
King
From Wikipedia:
Steam collects and reports anonymous metrics of its usage, stability, and performance.[23] With the exception of Valve's hardware survey,[24] most collection occurs without notifying the user or offering an opt-out. Some of these metrics are available publicly, such as what games are being played or statistics on player progress in certain games.[25] Valve has also used information from these statistics to justify implementing new features in Steam, such as the addition of a defragmentation option for game caches.[26] Announced on the 15th July, Steam will soon start offering users to allow Steam to collect the details of what programs are installed on their system which are listed within the Windows' Programs and Features control panel.[27]
This is intrusive for me. I don't want my gaming habits, browsing habits, living habits or whatever being datamined for commercial purposes, especially without my knowledge. For you information I even block google-analytics when browsing as a matter of principle.
Your argument is reasonable and I have no problems with it.
I disagree, because often in the past that data has been used for improving games and the overall service in Steam. But I will no doubt deny Steam's request to check my programs list.
EDIT: I would also disagree that it is without your knowledge. It's clearly stated in the terms of use.