How to deal with too much product variations / attributes?
Views Bulk Operations? There is also the Commerce Bulk Product Creation. Some more details about it (from its project page):

This module facilitates the creation of groups of related products in bulk. Product administrators can select a number of options for various fields, and a product will be created for all possible combinations of these values. Out of the box, only list fields are supported for this, but an API exists to enable other types of fields for 'combination creation'.
The module also provides various ways to create display nodes for the newly-created products:

Redirect user to node creation form (with title and product reference filled in).
Silently create display node referencing all created products.
Silently create one display node for each created product.

This will greatly speed up the task of adding numerous products at once.