Well - that sounds much less dogmatic than 'You should never use Vector'.
And you make some unintendet arguments
for the Vector-class.
There is a lot of code using old-fashion awt methods in
applets, and perhaps a lot of code using old Threads.
But the problematic code
is marked deprecated.
If Vector would be a serious problem, it should have been marked deprecated as soon as possible! Marking it deprecated would not mean it will not work as you know. And the more old code uses Vector, the more important it would be to mark it deprecated.
If you are a beginner, and don't know the difference between Vector and the alternative collection-classes, you should try to avoid it's usage, to make exchanging of your collection more easy, and not to get used to Vector only.
But in an intermediate forum, we can be a little more precise, than giving rules of thumb.
P.S.: I almost stoped using Vector in new code, but will not change old code using it, until necessary.