Mostly I think that developers such as myself would like an easy and affordable way to safely just save all their API data without having to write their own servers to transfer and cache and archive it and have it normalized with something like JSON-LD with a more sane API design, and perhaps use SQL or something like it to interface with their cached data. However, for non-technical users, I think a spreadsheet interface would be preferred and would open up your every day user to new world of possibilities. Either or, I feel what matters is taking ownership over your data (which can get expensive to retain with a given API) especially in these ransomware times. This sort of service I'm alluding to is easier to do with OAuth services than it is for say Twilio because this hypothetical service would need your API key which could be a deal breaker for some companies.
So if you could magically turn an API into a spreadsheet, what API(s) would those be and why?