In addendum to Illuvatar -
And as people have said here many times France is a much larger market.
Your Name. - Edition Collector Limitée et Numérotée Combo Blu-Ray/DVD/CD
"Edition limitée à 1 500 exemplaires"
I'm pretty sure the UK one had more than 500. And I distinctly remember that it was sold out real quick after it went online before the UK one. (I think even before it was open for preorder on the AL Store?) Seeing that sell out so quick was the main reason I went for the UK one when it was up, because I kind of thought it would sell out quick, even if it got more stock, because I knew a bunch of Germans who were all going for it as well. I guess I was wrong on that speculation...
But regardless, if the market were so much bigger in general it makes no sense to have lesser print runs than the one supposedly having the smaller market.
Also French Home Video releases have dwindled since (my impression) around late 2014. (I think around that was when Wakanim, Crunchyroll etc. went to be a thing?) 2013 saw the Edition Saphir, which I guess was a strategy that obviously must have failed. (I even triple dipped on Mushishi to support it, when I started, because I really like the Saphir packaging.) With 2014/2015 came those big digipacks collector's combos (which were at least still BD sized) and by now they are pumping out these A4 collector's regularly.
Kaze meanwhile has done all stuff with shared discs etc. and there is of course AL France.
I'm still looking at the French market, because I do enjoy the occasional French dub, but there really isn't all that much coming. Plus then it's either the same package of what I already have (if it's AL or occasionaly Kaze) or it comes with these totally bulky whatever editions. (I reeeeally miss the Saphir Edition.) And Blu-ray doesn't seem to be a big thing over there. It seems to mostly only come in combos, while the DVDs may get their single release (like with Steins;Gate.)
Also the only reason I can think of why the Post Nisemono Monogataris' combos ended up to be DVD sized instead of BD sized.