I don’t think LaTeX is necessary for any field. Yes, some fields benefit more from its use, but anyone who produces typesetting output of any kind—and that includes any academic field—can benefit from it. Yes, it does well at typesetting mathematical equations, but it does so much more, too. As I said before, LaTeX’s handling of documentation, flexibility with formatting tables and figures, and other things (ever tried to reformat all the section headers in a paper, change all the citations from Chicago to APA, or make an index for a book after it’s written? Yeah, LaTeX can do each of those with a single line of code) make it worth learning the relatively simple language to me (feel free to disagree).
This is an unfortunately common short-term thinking approach toward learning plain text language. Sure, crank out a paper in Word as quickly as you can, for it gets the job done. I get that. On the other hand, a long-term vision would highlight the importance of version control, integration with relevant programs (documentation and statistics), and ability to reformat or add entire sections with single lines of code.
Use whatever workflows and programs work for you, but if you want some control over your writing output, I recommend reading The Plain Person’s Guide to Plain Text Social Science by Kieran Healy (a sociologist, so from another field that doesn’t need LaTeX ).