Question. What is the justification for the Marine Corps to request 31 L-Class Ships?

Thanks to @RobWittman for supporting the over 4,000 amphibious warship industrial base jobs in Virginia by advocating for no less than 31 traditional L-class ships! pic.twitter.com/gD94R7fziP

— Amphibious Warships (@amphibwarships) June 7, 2022

I've been seeing this all over the place but I can't find the answer in the little research I've done.

The question.  What is the justification for the Marine Corps to request 31 L-Class Ships?  

I get that the Marine Corps is moving to the "Stand-In-Force" concept.  I get that EABO is the reason for being.  I even understand that the Marine Corps is planning to use the well decks of these ships for things other than vehicles for the GCE (unmanned surface and undersurface boats, sub hunting gear etc...).

I understand all that.

What I don't understand is why this number of ships is needed when the GCE is growing smaller.  It would seem to be excess capacity when you see the desire/requirement for Lightweight Amphibious Warships.

31 big amphibs and another 20 or more smaller ones?  In a time of great power competition, changing concepts and a smaller Marine Corps?

I can't wrap my head around it.  Hopefully someone in the audience knows.