I think the LaTeX compatibility came in a fairly recent version, but the usual Unicode-based syntax is already a lot easier to type (especially on non-US keyboard layouts) and read, since it's a lot more compact and uses whitespace to separate things by default instead of requiring large amounts of curly braces.
Re:Writing my PhD using groff
by ahmadmijot on Saturday July 23, 2022 @02:24PM
(#32206040)
Can confirm. I use the LaTeX mode in equation editor in Word quite religiously for both equations and symbols.
I was told by a friend that the Equation Editor in Word would silently accept LaTeX math-mode equation syntax and convert it automatically. Besides trying it out briefly, i never used it extensively, so I'm not sure how complete it is. Still, it's there.