IMHO the ability to record in LMMS is NOT crucial. As many pointed out previously, LMMS is not intended to be an audio editor. But a music maker. No serious music producer will work with a record directly from his daw. He will use a proper sound editor to do all the cleanup, normalization and tweak necessary to the record. Only after that, he will bring it to the daw.
LMMS is on the right path like this.