For a professional, what Acrobat pro can do is not available in any other program and (don't tell Adobe!) only 50 cents a day is an incredible deal

For example you can scan a sheet of paper, it does OCR on it and creates a font that matches exactly the one on page, then you can change words and sentences without changing the look of it.

Trim pages, remove elements, edit embedded images and vectors with other programs (doesn't need to be made by Adobe but it works better if it is). Change margins, fonts, colors, flow text differently, change the line spacing. Have a preview how color will change when printed, see if spot colors are used and change them in different ways. Edit transparencies, use plugins for extended repetitive work. Convert the fonts to outlines if the font has some kind of DRM and doesn't allow embedding, resulting in visual difference between other computers.

The nerfed standard edition at 10 euro per month instead isn't worth anything