One of the big benefits of LaTeX is the ecosystem of packages, but that only happens because so much effort was put into creating a package mechanism for the typesetting system. LaTeX has a long history of providing the technical infrastructure for package creation, and that was one of the main focus since its inception. No typesetting system can compete with LaTeX without a focus on package and template creation. My personal view is that LaTeX will continue to be king in this area for the foreseeable future.
Typst has a far easier to use packaging system but the default feature set is already good enough for the most.
Don't forget that many LaTeX packages exist solely because TeX and LaTeX suck and they are very underengineered save-the-day type of languages. They survived since everybody else asked money for their better typesetting systems. It is quite similar to how Unix and Unix-like systems survived despite the mountains of OS research and many new, more secure (usually paid) OS implementations.
I don't think it generates better results than Adobe Indesign nor it is easier to use.
One wonders why LaTeX has many users?Larger userbase can easily explained by being free. Students and PhDs usually don't have extra money to buy or nowadays rent Indesign but LaTeX is there for free. It doesn't mean it is technically superior or nice to use.
It does if one is doing typesetting math-heavy documents. Nothing really matches TeX quality or flexibility in math typesetting, not even typst (yet, at least).
