Idk, having only played Oblivion and Skyrim, I feel like (generally speaking) the simplifications in Skyrim were for the better. Take custom spells for example. Only a few spells really even made sense to make and it was better to make them in very specific ways. It's not like the games are super difficult. Fucking around with spells and more complex enchantments was cool but too easy to cheese.

Oh, and the leveling. Holy fuck what an over complicated mess. Where you could accidentally over level but also under level. Insane. Good riddance.

Complex systems are not inherently good. They're good if they provide meaningful choices and are fun to use. But ES has always been about the story and exploration more so anyways (in my opinion).