Lorca's not the only one who uses it in Disco, though. It actually happens relatively frequently in the first two season. Obviously for seasons three and four things have changed and it's no longer an issue.
Hell, in SNW while Kirk is on the Enterprise in "Subspace Rhapsody" he prepares some samples collected outside the ship to be beamed to engineering and thinks nothing of that instance of intra-ship beaming. I guess he forgot that whole event where people broke out into song by the time he was mid-way through his own five year mission.
What specific lore has been disregarded?