Regardless of if you like or hate Elsa, there is no denying how useful she can be in the right scenario. People often complain that they would never use her because there will always be a better champion, but she makes fights incredibly safe and stress-free. One clear example of this is Selective Timestream, where she has very easy access to an incredibly long incinerate. It makes the fights really fun without the constant stress of worrying about keeping up a shock, incinerate, or infection. Here is Elsa against the 7.1.6 Gwenperion as an example:
https://youtu.be/QwH4VGtpvTw