I am not against Package Management, I am against that how it is done in Haiku: it is complicated solution – it made system unnecessary more complex.
Problems with library versions can be resolved in more simple way: putting those version in different directories or/and with naming it different, no need for some virtual FS and additional special things in system. And you still can have some PM app to install/uninstall software – it is separate thing.
3 Likes