I'm really glad that they don't. I'd much rather have a safer PDF viewer that only supports a limited subset of what adobe's shitware does to handle 99% of my PDF file needs so that I only need to risk opening Adobe software 1% of the time. That's so much better than turning Sumatra into the same bloated mess of risky features that is Adobe Acrobat.

No need for Adobe: https://simplePDF.eu

Disclosure: I’m the developer behind it

I'm not sure, one thing I like about Sumatra is that it's very light and clean.

When we need to sign or view some complex documents then I'll use Acrobat.