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Until today I'd assumed there would be a limit to how many inputs and outputs you can mash into a single Macro. However I've just spent a few minutes experimenting and reached about 20 inputs and outputs for a single Macro. The resulting tool's anchors are practically unusable since they stack on top of each other but are indeed theoretically usable if you could carefully connect to each one.
Rather than spend the rest of my day trying to determine if there is a cap at some point, I figured I'd ask and see if anyone here knows?
I can't find any reference to a hard cap in any documentation but surely it must limit people from adding infinite inputs and outputs to a single tool.
As far as I know there is no limit to them but as you said, having a big number of them makes the macro unusuable. I would recommend you to use another method or think to solve the problem otherwise, like using dynamic inputs or the directory tool.