CS3 to CS4 observations

I've been updating a few ExtendScript functions from CS3 to CS4. I've noticed two interesting cases where it could be argued that something is broke, but it is hard to tell.

1. When setting fonts for app.findTextPreferences.appliedFont or app.changeTextPreferences.appliedFont if you set that to a non-existent font in CS3 it would fail (the value would not get set and there would be an error). In CS4 it succeeds silently, well sorta. The value will get set, but since the font doesn't exist, the find or change event will definitely fail. Which is better? I like the CS3 result.
2. In CS3 if you a looking at a link to a file you can use .update() to import the link again. In CS4 you can't do that if the link isn't modified. I like the CS3 behavior because it allowed you to reimport a linked text file that has been modified in Adobe InDesign, but hasn't changed in the file system. Now in CS4 you have to use .place() on the frame.
3. Definitely an improvement here. In ExtendScript you can use $.level = 0 to ignore many errors. In CS4 this works. In CS3 it was pretty much ignored. $.level has three values 2, 1, 0. When set to 2 it even stops at errors that are enclosed in try blocks. When set at 1 it ignores those errors. When set to 0 it ignores most errors.
4. Another improvement in CS4 app.applyWorkspace(). Wonderful.