EzekielRaiden
Follower of the Way
Well, keep in mind, Clerics have the smallest spell list of the full casters, and it's not even by that small a step. Wizards have a total of 335 spells, which is the obvious high-end outlier. But even Warlocks have more spell options (134) than Clerics (125), despite intentionally being presented as a class with limited spells so they have to think carefully! Bards have over 30 more spells (156) and Druids have over 40 more (169).I think Domain management and the War Machine are the biggest drops that could still be done for 5E.
Divine Spheres was an interesting concept that didn't play out well in game. As a priest, your spell list was limited to the spells under the spheres your deity had. This meant that each deity's priests could be slightly different from every other deity's priests. However, certain key spells (healing) were restricted, when they were a primary point of the class. To properly implement it, you'd have to move healing to become a class feature or provide a lot of non-magical healing options (like 5E did). Additionally, you'd probably need 5-10 times the number of spells, just so that every character could have sufficient spells at each level to choose from.
One possibility could be that every Cleric gets the "Heal & Harm" sphere automatically, and then their subclass gives them one or two additional spheres. This would make each Cleric subclass much more distinct, and push the player to think more specifically along the lines associated with their deity, e.g. Bahamut might give the "Protection" sphere (full of defensive buffs, zones, walls, and protective utility spells) and the "Hope" sphere (full of support spells, offensive buffs, utility spells that improve local conditions, and cooperative/diplomatic spells), while Tiamat might give Pride (all self-buffs, mind control spells, illusions, etc.) and, I dunno, Destruction (elemental damage spells, disintegrate, disenchantment, spell negation/reversal, etc.)
Edit: In fact, if you're familiar with the "Spheres of Power" rules, which were originally made for Pathfinder and got a later adaptation to 5e, then something kinda-sorta like those spheres would be quite appropriate.
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