I work with companies, which have a more like small scale production. They are about 100 or so workers. Yes, this is also possible. They grew their business in the last 25 years, when it was even harder to produce something than these days. At least one of these business have PCB suppliers in the EU, which helped them in the post COVID crises where everybody struggled with supply.

I just named some big name brands. I also know mid-size and smaller brands.

Building your business and getting your stuff together is hard for any startup in any business field.