I don't have any bars on my windows to prevent that.
You need to draw the line somewhere.
My Linux OS can hibernate, and I've not found it to be noticeably inelegant or inconvenient. I suppose others' opinions may differ.
I do. And, if I have a choice, I'd rather not have to wonder if this data is in the hands of a stranger after my laptop is stolen.
I'm quite sure if you look at your average thief and multiply these to chances together that's less than one in a million chance to happen. Assuming you're not some high profile person where the right person is out to get you and knows which OS you use, and knows how to steal from you.