@guenstig-kochenat thank you for your interest in the premium version of the plugin! There’s no official guide that would explain to you which CSS/JS should be unloaded and which not on a WooCommerce website. It depends a lot on the nature of the pages and usually, admins know which asset is needed and which not. There are plenty of WooCommerce plugin extensions out there that are loading their assets site-wide.
For instance, if you have one extension and you know its CSS/JS is needed only on the /product/ pages, then you can unload them site-wide and make an exception to load them if the URI matches the following regex: #/product/#
I know, having a step by step tutorial (even for certain popular WooCommerce extensions) would be ideal, but at this time, there’s no such option.
PS: FYI, if you’re still interested in getting the Pro version, there’s a 10% discount that you could get if you fill a quick anonymous survey here: https://www.gabelivan.com/redeem-coupon-survey/?utm_source=wordpress-org