No, just paranoid
If I absolutely had to know what happened during an installation, it's the only method that would satisfy me. Worms and net-based malware are getting very sophisticated about hiding themselves from the OS. Even an application you install intentionally will frequently leave traces of itself around when you try an uninstall, and the Windows community only sees this as "not well behaved."
Considering the people who are supposed to know the platform consider non-removable installations to be no worse than mis-behaving, I don't put a lot of trust in the tools they've come up with. Besides, you should only have to do the verification once. And it is a necessary step in a full-scale security audit.
So how paranoid do you want to be?
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