I have been using the addon "Shift Render Slot" for Blender since I first switched from Cinema 4D in 2017. (In C4D there are no render slots, you just get a full history of your renders automatically, which I miss terribly, so this addon was the closest I could get to bring that optimization back.).
To my dismay it is now broken in v3.5. I've written to the developer and he said that due to a core code change the addon can no longer work :(
For those unfamiliar: the addon would automatically advance to the next blank slot whenever you hit render. Otherwise you have to do this manually, and if you forget you will overwrite the render you just did (which I now do constantly).
Personally, I can't see how the developers ever thought this was a good idea. I'm so taken back by this that I wonder if maybe I'm missing something, so I wanted to start a conversation and see if you guys could weigh in on your workflows.
Please enlighten me, I would love to hear your best practice when developing a scene and doing a lot of iterative renders, where comparison is paramount to your development process.
Cheers!