Personally I’d be inclined to have nodes assets with more inputs rather than small ones. For example noise and grain could be combined, sepia tone could be part of a bigger color manipulation node. VHS and Infrared look I’d probably leave out for being more demos than practically useful.
Gamma compression (correction?) seems like a legacy thing that should not be recommended to be done as part of compositing, but left to color management.
I wonder if closures could somehow be used to layer effects. We’re considering them for light filters in light shader nodes as well. But not sure yet if it’s a great fit.