Can you give a specific use case?
Often, if you’re having to conditionally specify a field to modify, that’s a result of inefficient building.
Take an Order, with fields orderDate, dispatchDate, deliveryDate, returnDate. There’s a good chance you’d find it a lot easier to have an Order Update data type with a date, Order, and Status field and save them as a list on the Order. Then, you just edit Order Updates:filtered (your status type) : first item.
The one thing I could see this definitely being useful for is having a reuseable input and button, but autobinding kind of solves most of that already!
If we can come up with specific use cases then it’s more likely to be implemented 
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