There are several versions of clang being used around there, with corresponding libclang versions. Libclang is not backward compatible, thus, migration to a new version would either force to support ICA on both versions or to abandon older clang support
Making it standalone (ideally, statically-linked) executable would give much more freedom for developers to base on any libclang version they want and for users to not maintain their clang and ica versions synced
There are several versions of clang being used around there, with corresponding libclang versions. Libclang is not backward compatible, thus, migration to a new version would either force to support ICA on both versions or to abandon older clang support
Making it standalone (ideally, statically-linked) executable would give much more freedom for developers to base on any libclang version they want and for users to not maintain their clang and ica versions synced