an all-in-one download would be a bad idea as the only option. I DO have DSL but a file over 35 MB can take over an hour to download. I am more concerned about the number of files that get to the last couple of minutes of the download and crash because of a "file size mismatch" -- whatever that is exactly -- and then I need to try again (if any clicks are left) with a different download option that takes even longer than the original attempt.
Folders in folders can be a hassle but not something to get hyper about. Unzipping files and downloading files is the "cost" of doing digi-scrapping.
Now, a gajillion space-wasting previews of other kits in every folder is something that really frustrates me. Sure, I have a TB external drive but sad to say, that is quickly filling up with photos and LOs plus kits ... and I need to take time to delete all the extraneous stuff -- like those previews. I'm learning to do that immediately upon unzipping the file.
just my 2 cents ...