What do you think? If Cortana is in Infinite, should she have -Yoink!-?
yes it’s a joke.
You ruined the joke by saying it’s a joke.
I suspect she’s sorta “formless” at this point, integrating herself with all that forerunner technology (the domain?). Thus she could have any body parts she wants 
Side note, isn’t “the created” all merging with the domain kinda like the AI version of the flood? Live forever as one… One big meaty unit.