PDFs are fine and dandy, but if you expect to sell me a complex device of any kind without a printed manual for “ecological reasons” well good luck. I’ll wait and buy your product secondhand for ecological reasons too.
Joking aside, manuals are essential for me, mostly as a reference for features not often used, and I tend to read printed manuals very differently from how I read pdfs, also they give gear a psychological permanence to people who plan on using the equipment for many years.
If a company is aiming for people who don’t RTFM, and whose products are replaced every couple of years with the next thing, then I can understand no printed manuals because that is disposable throwaway product culture, but any serious company making expensive and complex devices should include printed manuals, as most do and always have.
In my experience the firmware changes so little over the lifetime of Elektron gear that addendums are adequate to update any changes.
And on the ecological thing - I’d much prefer a company to make products that are good enough to make me want to use them for at least 10 years and to provide proper support, like manuals, spare parts, servicing and so on. Also on the ecological thing I’d bet that printed manuals would be kept longer than the electronic devices pdfs are read on, think about that.