database structure - not null and no default for lots of columns

Hi all,

I am coding data import for large product base. I am sticking them straight into the Nop database as that seems the simplest. While doing to I could not wander about why many not really required columns are not made to allow null or at least given some sensible default parameters.

For example while working with the database I have to set
IsDownload, DownloadId, UnlimitedDownloads, MaxNumberOfDownloads
in the ProductVariant table, even though my products are not downloadable.

Sorry if the question seems stupid I am sure there is some good reason, but I would appreciate if someone would tell me what it is.

Thanks!

Filip

PS. Otherwise I've noticed that database structure in 2.0 has gone though a lot of changes .. all of which so far seem for the better :-)