The problem with feedback "being too long" is often players get lost in their own point. (I've done that myself). Now, don't be foolish. You're a dev, you spend 8-10 hours a day at your job. Nearly EVERY MINUTE of that job, you ARE actively doing SOMETHING. Writing code, checking spreadsheets, attending meetings, discussing issues with another dev, having lunch.
Now think about that. You're actively doing something NEARLY EVERY MINUTE.
When do you expect the devs to magically find time to read 6 paragraphs worth of feedback written by a single player, who probably had a good point to make in the start but has 'rambled on' so much, he's gotten lost in his own feedback and forgotten what his point actually was.
Now, not only do you have to READ that ENTIRE THING, you now have to re-read it several times to try and understand what the player's underlaying issue was, or what critical feedback he was really trying to give.
To do that for a single player, JUST ONE: would take nearly 15-20 minutes.
Now imagine that x1000s of posts PER DAY on the forums. And 10,000+ Tweets PER HOUR, PER DAY (and that's lowballing, I'm sure they get ALOT MORE.)
And you're going to sit there and suggest that they're "just using that as a cop-out"?
I'd love to see you do their job + the job you think they should be doing and see what you think of it then.
"We are busy. You don’t want to make us digest a wall of text just to distill out the really critical information. You want to write like Hemingway: use just enough words to get your point across, and no more."
The CMs are the ones who's jobs it is to read paragraphs upon paragraphs and posts upon posts of information every day, take footnotes, and try to discern the real core issues, then relay that in meetings to the devs in as short and concise as manner as possible, so the devs can 'cut right to the chase' and hopefully, quickly understand the real issues players are having, so they can get on with trying to find a solution.
The shorter and more concise the CMs are, the more problems they can bring to the table in the time they have for the meeting and the more problems the devs hear, the more problems they can look at solving.
Ghostcrawler, Celestalon and Watcher have ALL SAID in the past that they like receiving feedback via Twitter more because you literally CAN'T go on and on and on .. you HAVE to stop and think: "What is my real issue here? What do I REALLY want them to 'get'?" Even if you send multiple tweets, 3-4 are still nothing compared to what you would have typed had you posted on the forums and had the room to just go on about it in fine detail.
Celestalon said once, he can stop and set the computer to recompile a new build or add new code and that takes 10-20 minutes and in that time, he can read a few dozen tweets and respond to several of them before returning to work. In that same time period, it's unlikely he'd even get through one forum post if it was very lengthy.
That's the entire point of the issue. They are very busy, all day, every day. They want to hear what you're unhappy with but they don't have time for the long version. They need the short and sweet version, as best you can offer.