Question: with pre-made loops it seems fairly easy to make something that sounds decent. Is it okay if it’s really that easy? Could you put a few of these together and release a track? Should it be “hard”? I’m sure most producers have fiendishly complex arrangements. But do some producers basically paint by numbers?
One, because it's usually quite boring. Two, usually because we've heard the samples a hundred times before and know roughly where they came from, or at least where they've been used before.
That being said, most large artists do percussion and whatnot from scratch, perhaps re-using individual sounds but almost always coming up with their own arrangements.
A notable artist (group) that used sampling almost exclusively is Prodigy. They're famous for coming up with unique ways to arrange old breakbeat samples and whatnot. I would be surprised if anyone had any issue with it.