due to the fact that Unicode standardization is a thing, that means certain releases become unfindable. for example, any release of 4×4+12 can't be found with a search for 4x4+12 (note the letter "X" instead of the multiplication sign "×")

https://musicbrainz.org/search?query=4x4%2B12&type=release&method=indexed

https://musicbrainz.org/search?query=4%C3%974%2B12&type=release&method=indexed

if the release group aliases were implied on the release level, that could quite easily solve the issue, as well as others, including transl(iter)ations in aliases and common unofficial names (like the White Album and Led Zeppelin IV)