TL;DR:  This deal for PDF Expert Premium Plan for Mac gives you  full access to a powerful PDF editor  for a one-time $79.99 (MSRP $139.99), letting you edit, annotate, sign, convert, and manage documents with far less friction. PDFs are supposed to be simple. Instead, they usually turn into a chain of workarounds — print it, sign it, scan it, resend it, then hope nothing broke in the process. Even basic edits can feel strangely complicated for something that's meant to be universal. With a  PDF Expert Premium Plan for Mac  — available for a flat $79.99 (MSRP $139.99) — you get a full set of tools designed to handle everything from quick edits to full document overhauls without leaving your desktop. PDF Expert pulls everything into one clean workspace. It's built for people who just want to open a document and actually do something with it, not jump between tools to make a small fix.…