Problems with foreign languages in texlive (babel package)

To my great surprise I’ve found that ‘texlive’ suite (TeX, LaTeX) in 8.x (be it Rocky or CentOS) apparently lacks full support for languages other than English and German. If I put
into my document, LaTeX fails to find polish.ldf file. No package seems to provide it unless I miss something important. In 6.x, it is a part of the general “babel” package and it works fine. In 7.x, the file is still in the babel but LaTeX reports no hyphenation patterns for any language but english (although the package texlive-hyph-utf8 contains several files hyph-pl*.
I tried to use tlmgr install babel-polish but it gave a warning that this would ruin the RHEL texlive installation so I gave up.
Ubuntu and other debian-like distros provide texlive-lang-XXXX packages which contain all needed data for TeX/LaTeX internationalization.
The decline of support in subsequent versions of RHEL/CentOS/RL seems to me so absurd that I suspect I may be really missing something important.
Any hints would be very appreciated.