Remember, a rock to the window will get someone into your house. A bolt cutter will take off small padlocks. So yes, most locks are there to protect from the casual or opportunistic thief. That doesn't mean we don't need the of course.
Security films that dramatically up the ante on what it takes to go through windows are getting cheap and easy to install. If I had thought about it when I got my windows tinted a few years back I would have just had them added on, especially for my downstairs windows (not sure I would bother with most of the upstairs - I have no trees or easy access to most of them).
There are many simple things you can do to dramatically up the ante on what it takes for someone to molest your stuff. A recent news story talked about people using coat hangers to trip emergency garage door releases so a quick re-security it with a zip tie that will break with a solid tug for it's real use, but be too hard to break with a wire from outside is all that was needed to close that "hole".
Need a place to share this kind of stuff for homeowners. I recon it would probably be a small percentage but still a large number.
I'm sorry, but your anecdote smells. If you are robbing houses at random, the last thing you want to do is rob an occupied home. You rob an occupied home for a reason specific to that house or the owner of that house.
Most burglaries happen in the daytime when people are at work and their houses would be locked regardless.
And the most common form of home theft nowadays is package theft. Which isn't going to be thwarted by locking your home since, you know, the package is just sitting on the porch.