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 I think there’s your answer.  First one is easy for all client devs to integrate, second is not.

There could be a NIP for custom image reactions, but standard emojis etc will always be easier to support cross-platform/app 
 I totally get that, I was just wondering if it would be possible or worthwhile. To me, it would be worth it, but I ain’t coding 😂 
 Gotcha.  Maybe you already knew and qualified the difference in your OP, pls “tard” me up.

It’s not impossible but probably needs a standard / NIP before clients could consistently consume/didplay those custom reactions.  (This could already exist, no idea) 
 Centralized easy, decentralized hard :)