>>I think you missed the point. I like understanding the why as well, but it doesn't actually matter.

Of course it matters. If you understand why, you can take steps to mitigate it or work around it. In this particular case, one workaround is to close unused programs and browser tabs every now and then to clear up memory so that the active tabs don't go through a forced-refresh. This is what I do on my 4S, and I haven't had to deal with the problem the OP describes in a long time despite being a "heavy" user.