Why does `hugo new` try to update modules?

[kaushalmodi]

… but I also found the “module correctness check” to be over-eager.

Related:

`hugo mod init ..` fails to create go.mod if hugo detects an error prematurely in site config.toml

I am converting a bunch of my websites to use Hugo Modules based theme and component fetching instead of using git submodules. During this conversion, I believe I have come across a bug. My config.toml of few sites use an output format defined in a separate git repo aka module. So when I switched to using Hugo Modules, I simply removed the theme variable, themes/ directory and add module imports to my theme-turned-module. Note that my site is already building using the old themes/ approach a…