Adobe (reader and otherwise) == WORST SH*T EVER.
I still love how Acrobat Reader (7.x anyway) won't LET me open more than 50 PDF files at once. Nothing to do with RAM free, it just WON'T LET YOU.
This is in contrast to my typically having like 300+ Firefox tabs open at once, maybe about 500 files open in emacs at once, etc.
Then there's the spyware where it contacts 3rd party tracking web sites when you install it or open various documents without your awareness or consent.
Oh then there's the fact that in 2008 while we have multi-tabbed web browsers as standard, EACH AND EVERY PDF opens in its OWN window.
Oh then there's the fact that in 2008 when every major web browser out there can bookmark your pages / positions, you CAN'T bookmark all open PDF files and positions within them, manage the bookmarks, etc.
Oh then there's the fact that thanks to their cr*pware lots of publishers inadvertently do something stupid like setting the "can't copy/paste" bit in PDFs so even for documents you HAVE to copy / cite data out of as their INTENDED USE you CAN'T. Real f*ing joy to hand-type in like 800 lines of numeric data from some engineering specification so you can actually buy/use the part it describes in your CAD system just because some a$$hat decided it'd be fun to publish the specs. in a PDF file instead of, say, a database, XML file, ASCII document, whatever.
Oh and then there's the situation where most of the web is indexed in search engines like, say, Google, and you can do the same with lots of your local text files, office documents, etc. But PDFs? No. It'd be like... asking...toooooo...much... to actually have an efficient (AND FREE!!) way to SEARCH the content you already HAVE access to.
Oh and of course there are all the lovely present / past remote code execution attacks (at least the most recent one I heard of was still UNPATCHED) that lets someone hijack your computer just by sending your browser an exploit PDF file that the browser plugin processes.
And of course thanks to Adobe and the most lovely Microsoft, you can't even search / use metadata about your your PDF files so you can, say, search by AUTHOR, TITLE, DATE, REVISION, SUBJECT, or even use PDF FILENAMES with decently long filenames according to the actual TITLE/AUTHOR of the document because of course you hit the 128 character limit too soon and can't use special characters like ":" etc.
Burn....in.....hell.....Adobe...and anyone stupid enough to INFLICT a document in PDF format on the world. Please learn how to use things like OOXML, XML, SQL, LATEX, et. al. instead.
xpdf / evince / et. al. under freaking LINUX is a lot more USABLE in many ways than Adobe's own spyware/cr*pware/bloatware under Windows.
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