Using LaTeX is mostly fine, except for the endless compile times, useless error messages, lack of unicode, etc. like the GP said.

I'm maintaining an internally used LaTeX document class and the development experience is even worse. TeX has no concept of such avant-garde ideas like lists, dictionaries, or namespaces. Things break all the time, and sometimes only when you load three specific packages in a specific order because they all patch each other's routines. I still haven't completely groked the idea of fragile commands and expanding macros. Characters can change meaning depending on context, even the `comment` character (%) or the `escape` character (\), (and I believe even the curly braces) for example when used inside `\path{}` or `\url{}` [1]. It makes a difference whether you comment out line endings or not. The LaTeX3 syntax looks like a bad joke. I mean, look at it:

\ExplSyntaxOn \tl_set:Nn \l_tmpa_tl {A} \group_begin: \tl_set:Nn \l_tmpa_tl {B} \par value~inside~group:~\tl_use:N \l_tmpa_tl \group_end: \par value~outside~group:~\tl_use:N \l_tmpa_tl

\tl_set:Nn \l_tmpb_tl {A} \group_begin: \tl_gset:Nn \l_tmpb_tl {B} \par value~inside~group:~\tl_use:N \l_tmpb_tl \group_end: \par value~outside~group:~\tl_use:N \l_tmpb_tl \ExplSyntaxOff

????

Let's just let it retire and focus our efforts on Typst and pushing publishers to accept Typst.

[1] Just look at all these poor souls trying to achieve something as exotic as putting a URL with a percent sign inside a footnote: https://tex.stackexchange.com/questions/12230/getting-percen...