TerraDave
5ever, or until 2024
...A cleric focused on divinations is very different from one focused on combat. It's a significant balance factor because unlike wizards, clerics had a ridiculous variety of spells to choose from every day. Taking away that versatility reduces the CODzilla factor a bit. There's also more of a sense of casting in real time. It seems strange that a cleric can't pray when he needs something right now.
...
This gets to a key issue. Pre 4E, clerics "knew" all there spells, which greatly vary in power, so preparation was a key balancing tool.
If you want an alternate, then no, they shouldn't know everything. And all those issues 4E tried to address...combat attack versus combat utility, versus non-combat, and how you balance them come to the for.
I don't a system were half the spells are never used, and clerics can just spam hold person, say.