It's unusual, but IMO makes sense, as it encapsulates complexity better than LOC do, because the latter are more sensitive to formatting preferences etc. Books

It's unusual, but IMO makes sense, as it encapsulates complexity better than LOC do, because the latter are more sensitive to formatting preferences etc. Books are also measured in words too (also for category thresholds, e.g. between a novella and a full novel), so there's precedent too.