[epoch1970]

Except that around 90% or more of the time I find myself having to open PDFs using a real native PDF reader because pdf.js is too slow, or it improperly renders the PDF, or it won't allow me to fill out forms the way I want, or some other issue like that.

So even with pdf.js present, I end up using a proprietary reader most of the time. The added hassle or reopening PDFs in a separate reader most of the time exceeds the supposed convenience of the reader being built in.

[signal11]

I guess it's the type of PDFs one views. I find pdf.js quite adequate for my needs. It's even rendered brochure-type PDFs quite well -- e.g. this 32 page brochure that was a top hit for [filetype:pdf brochure]: https://www.mbusa.com/vcm/MB/DigitalAssets/pdfmb/brochures/M...