XSLT 1 and 2 differences (d-o-e and namespaces)

I was going though the new features provided by XSLT 2.0 language. I
found that disable-output-escaping is now discouraged. I thought d-o-e
was useful under special circumstances.. Why it will be deprectaed in
XSLT 2.0? And what will be similar alternative in 2.0.

Also I found that namespace axis is deprecated in XSLT 2.0 . Why it is
done so? Is it not an useful axis for XSLT programmers?

I'll appreciate any comments on above doubts..

Thanks