I don't think a formal union is necessarily required. However, American business culture has such an antagonistic relationship between management and labor that it is likely such guilds' input would be automatically discarded by many companies' management. Compound that in tech the spirit of worker solidarity or even collaboration is often dismissed, you don't even see engineering "guilds" forming at tech companies.

I think a true middle path would be German-style co-determination, where there is active engagement and cooperation between workers and management as equals, moderated by the government.

https://www.deutschland.de/en/topic/business/co-determinatio...

https://www.eurofound.europa.eu/observatories/eurwork/indust...