Yes, to dissuade reverse importation, Japanese licensors began requiring (or in some cases offering as a cheaper licensing option) many North American, anime Blu-rays to maintain locked subtitles, as a means of diminishing the quality of the usually cheaper, overseas discs.
For a variety of reasons, including cost to import and somewhat similar pricing to Japan's OOP version of the materials, locked subtitles on North America's (and by extension some of Europe's) release of the OVA + Movie feels unnecessary, since it's hard to imagine any appreciable amount of either the existing or forthcoming vinyl set hitting Japan's secondary market. I do wonder, if we aren't getting screwed by the eventual movie-only disc; assuming it'll be priced in a manner that undercuts the existing Japanese version, the decision may have been to just lock subs on everything.
I recognize many don't care, but the addition of locked subtitles made it incredibly difficult to purchase the goofy set that AnimeLimited produced. I will, at least, give the company credit for openly acknowledging the lock subs, prior to release.