I find the current bundle feature misleading. It only allows you to include a single product at no cost to an existing product. Sort of like, “buy an iPhone, and we’ll throw in a case”, in which the case is ‘bundled’ with the phone.
What would be nice to see, however, is actual product bundles, packs, combinations, groups, or whatever else you want to call it, where you sell groups of products together and can assign a price less than buying them all individually. Or there may be cases where a product can only be bought as part of a combination. As far as I know, this is not currently possible with OXID, but have noted it’s availability on comparative e-commerce platforms.