A lot of tuning files for objects exist in the game as "templates". They can be used as a functional tuning file, but you most likely want to give them more specific functions, so you copy that general file and change it. That's the case for beds, even if some might not have any differences.
There is no point to make tuning files for each separate object if they do the same exact thing. That's the case for the potty chair.
Injecting for specific objects is bad and you should not do it unless you really just want it for specific objects. You want to use tags.
This is an example from my special affordance injector: https://pastebin.com/r5AVKm8F
This example adds affordances to all mirrors in the game, even the CC ones (if they are tagged right, which they should be). You can do that with most objects in the game.
You can find all of the tags in the game in this XML file: S4_03B33DDF_00000000_D89CB9186B79ACB7_tag.xml
My affordance injector is not yet public if you're interested in that. Eventually, I will release a bunch of utilities to make scripting Sims 4 easy.
