Merchandise saved Gundam franchise.
Gundam anime back in 1979 was about to get cancelled but Gundam toys sales saved them.

The movie itself is not for charity. It also need to get sell well. So what's wrong with making merchandise?
Personally I care less with the movie but more into the gunpla kit they will make.
If design something like MG Storm Bringer that would be cool(had zero interest with the Build Divers manga as well)

That brown made it look appear the mech was standing by a muddy road after a heavy rain... a car drove past and splashed the mud all over his cape.