You are right.To be fair the Cleric wasn't particularly limited by sphere (he only didn't have access to some spheres that were traditionally druid spells). The Cleric had all the armour, decent weapons and virtually all the Spheres, it was only the Priests of particular gods that were introduced in the Priest Handbook that were more balanced and had a more limited sphere selection based on what weapons and armour they had access to.
It's actually me that's the confused one, some years since I played 2e. Anyway, my point still stands, the 3e cleric is a beefed up version of the 2e cleric, having some of the stuff from the priest (domains - but now as extras, and domain powers - also extra). I think something close to the 2e priest is a better alternative than the 3e cleric for the 5e cleric.
