HDP 3.0.0 underwent extensive testing to validate that a wide-breadth of features work as expected. This includes the versions of Hadoop and HBase that were shipped. As with every release, there may be issues lurking, both known and unknown. We do our best to call these out as a part of the documentation which accompanies every release: https://docs.hortonworks.com/HDPDocuments/HDP3/HDP-3.0.0/release-notes/content/known_issues.html. The Apache communities must "support" a significantly "wider" compatibility matrix, and move much more slowly to call things stable. If you have concerns about versions of components shipped in HDP, I'd suggest that you reach out to contacts in support or sales so that we can have a meaningful discussion on specifics. Thanks!
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