The big prints talked about, 30x40cm, worked through with the Collodion Process and paired with their technique provided much detail as we have seen, they also at times (before Nap's jobs) explored a bit of Europe to get pics of interesting sights from other cities and sell them as big souvenirs, proving to be valuable architectural data after the events of WWI and even WWII. Seen here are the Guild House of the Free Boatmen in Belgium's Gand/Ghent and the Chateau de Chambord, a famous french palace but back-then an abandoned castle, unfinished and used previously as plenty of things except a castle or a palace. Same with Honore's photo, the best around is property of the stock overlords.
Anyways, this way of work seemed to be having a contrasting battle against a popular format in those days called the carte de visite, roughly translated into Visitor's Card or Card of Visit, their purpose was to have a cool enough space to write things down like name, address, note section and at later dates even phone number. The other side had a bitching image of yourself or something else representative of you, the size? 6x10cm at most.
The freres didn't want to dumb down their complex images and still wanted to hand the photos like paintings or images honorable enough to hang on the wall.
Les cartes de visite were an important part of the social life and complexity of the french, much like a bunch of yuppies flexing their presentation cards made with eggshell texture, kids bragging their baseball/pokemon cards or teenagers collecting italian-made football squad cards in World Cup days, the french likewise liked to strut their stuff and/or leave their shit in houses with a note behind telling their pals "where are you?" along with their mug on the front with a rad suit and a curly mustache. The unsuspecting gift receiver was left then with an item to fill their personal logs or family books with pictures of their friends, contacts or merely a cool picture of a famous dude or composition.
So, as you can imagine the lack of that presentation meant no cool points, no coolness means no money, no money means no resources, no resources means no photo and there you have it.