You also have to realize the scale and complexity of this update. They're changing several systems integral to gameplay: siege and spells, with some other edits on the side.
On its own, revamping the remaining the spellbooks for all 9 released factions is a daunting task in terms of conceptualization, coding, and testing. There are four spellbooks unreleased so far, and unless you want the Edain Team to leave Arnor, Lorien, Imladris, and Angmar out of 4.5, I recommend patience. Play Edain. Play something new if you want something fresh. Find a new hobby.
I tried coming up with new spellbooks for the unreleased ones on my own, and they ended up subpar or incomplete. That's how difficult the task is. If you're that impatient, then try contributing suggestions or volunteering your services in conceptualization, coding, or testing. But if complaining is all you offer, please save it. It won't help.