I do have many iso images, but i find floppy images terrible. For iso you can open them quite easily with winrar and usually its only one file. But floppies have the bad habit of having low capacity and when i see someone proudly bringing me Office 4.3 Professional on like 50 IMG floppy images i could start crying.
Maybe its good in dosbox, never tried that, thankfully never needed to. Probably you can work with it easily.
But for me personally i NEVER need floppy images as i dont wanna create floppies. i dont want virtual floppies i just want the files. When i install old software on my laptops i usually just throw the files on a CF and thats it. So if i get a handful of IMG or IMA files i obviously need to extract it and that's where the whole tragedy starts imho. unlike iso IMG and IMA are not really standards but just funny extensions the creators of countless disk imaging tools invented. Maybe one of them is even a standard, but obviously not standard enough to rely on it.
Most of the times i can even read them with winimage, but if i can't then i'm really screwed as that means it has probably been made with some obscure proprietary software i will probably never have. And even with winimage its not really fun to extract a dozen of floppy image files.
If there is some proper reason like some copy protection scheme or other "unreadable" parts on the disk i understand that an image is a good solution, otherwise i regard them as a real disadvantage unless you are someone who really enjoys creating physical floppy disks from image files.