- it's been unreliable in the past, causing issues with Nifty and its tools
- to gain a slight speed advantage (one less call across the internet to another service)
Edited to add: After further research I find I can't get rid of YQL in any of the javascript-based tools. This is because browsers automatically prevent "cross origin resource sharing". It's a fancy way of saying you can't access some forms of resource held on a different domain to the one the javascript is running on. YQL gets round that and I can't find a different way
😢