Freeing up inventory wasnt the only point of this suggestion, just a nice perk. I just like the idea of having certain items that require lower level items to buy, even if you only need one item and can then upgrade it to another. It makes some of the really powerful items seem more valuable and allows players to have more of a stretegy when building their demigod.

There purposely aren't item recipes. It's better this way, because you don't have to remember a whole slew of recipes. I mean, they could have done something like

Bloodstone Ring $1750

+

Narmoth's Ring Recipe $2250

=

Narmoth's Ring $4000

But instead, they just have Narmoth's Ring $4000. I think it's much better this way.

They dont have to complicated recipes, i dont think remembering you need one ring to get the next one is hard to remember, and there shouldnt be nearly as many as Dota. Like borichka said, recipes are fun, it adds a lot more depth to the game if you cant buy some of the best items in the game without the item that you would probably have anyway since its just a cheaper version with lower stats.

Oh god no, in DoTA it was so confusing what items to get and where, I searched forever where I could get the stuff for X recipe