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Nature + Chaos certainly sounds powerful and intimidating, but... consider a simple example, a tournament game. You're playing as Nature. I'm almost 100% sure that, regardless of the build, the fifth level of Nature magic will be very useful, especially if it includes "Dragon's Might" or "Summon Mantis." Then the question arises: to get the most out of Chaos, you need to level it up to 3-4, which requires a significant amount of experience, and you also need, for example, Warfare, or have two heroes, a mage and a warrior, in which case the experience is divided between them...
regarding Death, in my opinion, Death is only needed for Nature because of Demonology, although it's unlikely to reach Devils, but Cerberuses and Demons will do, but why does Nature need Death curses, especially since Death has some spells that are mainly suitable only for Death itself, such as "Dreadful Song," "Life Drain," "Plague..." so not all curses are universally applicable.
P.S. The fifth level of any magic has never hurt anyone