JavaScript itself is not usually the problem (aside from certain fundemental issues). The computational gap between a developer on a M3 Macbook and a person on a used Dell from 2008 is already quite large, meaning what feels "snappy" and "responsive" to the former can feel "sluggish" and "annoying" to the latter.

The other factor between the two people can be network speed, many areas of the world have access to extremely limited bandwidth, very slow bandwidth, or a mixture of both!

Combining both the computational gap and the bandwidth gap means the issue of large JavaScript files blocking access to information on a global website is an accessibility concern. People who block JS are pushing for a more accessible web, either directly or indirectly.

I won't fight tooth and nail for all websites to _not_ have JavaScript, but I wish they would be progressively enhanced by that JS and still (at least in the core sense) usable without it.