grammaticize

the very first attempt to embody, to arrange, or to grammaticize, this language

... organization (hence its heavy reliance on passives), but does not seem to grammaticize any person-based constraint. In languages with canonical inverse constructions (say Algonquian languages), the non-local person-based constraint is the primary determinant of argument encoding, and ordinary notion of topicality (which is local) plays little role.

Or to put it another way, the present tense use did not grammaticize. I suggest that the reason for this is that the habitual was more frequently used in the past than the present, since in the present there would be fewer cases […]