In the past I've often ran a cleric, and our team always just plays the low levels, retiring around level 5-6 and starting over then.
I have noticed however that I take revivify each time, and make sure I always have a diamond with me to revive someone, to the lengths of selling all my equipment if I have to.
However it also meant that at low levels I almost certainly cannot really do much in a fight, even at 4th level only able to use 2 level 2 spells a day for the "possiblity that I need to revive someone".
Further I notice that if we didn't have a cleric which has revivify prepared the DM would ever so slightly either nudge the balance to make sure people don't really die. (or people are content with rerolling a character anyways when they go on a suicide mission).
This left me in a place where I wonder: is revivify worth keeping a spare spell slot open for? Or even going to the lengths of getting the diamonds at level 3 and preparing it in the first place?
Is it a trap as decent play prevents deaths anyways, and there are other ways to revive someone using sidequests? (often much more easy than 300 gp). And in the single case I noticed that where deaths happened it was a tpk anyways with the bad guys "focus the healer".