Hello, I think biblatex is often used and I am a bit tired of manually needing to install it on my systems :/ I am unsure about what texlive metapackage could fit better to pull it in... but maybe dev-texlive/texlive-bibtexextra as it provides some modules needing biblatex Thanks!
it should be app-text/texlive *** This bug has been marked as a duplicate of bug 494542 ***