Standalone LT could use system-wide installed Hunspell (libhunspell.so and dictionaries). It would make life of package maintainers a lot easier!
It should be clear that LT uses first Hunspell offered on system level and only when it is not present Hunspell which it ships by its own. For Linux (also as a plugin for LibreOffice), please do not ship Hunspell with LT.
The plan is to remove hunspell altogether, so we want less integration with anything hunspell-related rather than to try to integrate with it.