I get its a constraint of the language but the ubiquitousness of bundlers and differing toolchains in the JS world has always made me regret trying to use worker primitives, whether they be web workers, worker threads and more. Not to mention trying to ship them to users via a library being a nightmare as mentioned in the article.

Almost none of them treat these consistently (if they consider these at all) and all require you to work around them in strange ways.

It feels like there is a lot they could help with in the web world, especially in complex UI and moving computation off the main thread but they are just so clunky to use that almost nobody tries to work around it.

The ironic part is if bundlers, transpilers, compilers etc. weren't used at all they would probably have much more widespread use.