From my experience, institutional traders are much more multi-dimensional and relative-value oriented. (They're almost all spread traders of some sort). Please recall that I used the term "hedge" for good cause in my previous post.
Sure, an big institutional trader may have a huge short block trade of ES go 85 points against him. But he will almost certainly have a corresponding long position - for example, he may also be simultaneously long VIX or long the Russell 3000.
I consulted for an algo trading group a few years ago who did stuff like buy a basket of 20 or so STARS in the S&P and then short the ES as a hedged spread trade.
Big swinging dick institutional traders have so much more breadth of intuition and creativity. They have a carefully constructed a 3-D premise of simultaneous value and overvaluation in markets. They are also hell bent on generating alpha - that's what attracts the big fees.

Alpha gets you PAID.
For example, a big swinging institutional dick might buy big blocks of 3 choice gaming stocks like ATVI, EA, and TTWO in a basket and then short a the corresponding correlated hedge (in this case NQ).
When the market went to hell in 2008 I saw guys buying baskets including McDonalds and Campbell's Soup and selling the ES. It was brilliant.
I knew a guy who was long IBM and short HP for like two years straight. His bonuses were life altering.
Any monkey can short a single name because he thinks it's shit. So what. No smarts in that.
Of all the institutional guys I have trained or met in the business, I can only think of a couple who took outright directional risk. It's just not common and most retailers have no clue.
And retail traders can
definitely trade relative value in their IB accounts. Even their IRAs.
The other piece is that their are literally millions of variations, permutations, and combinations to this approach. You essentially build your own market. Use your intelligence. Use your creativity. Make yourself valuable.
There really is no institutional trader that I've ever heard about who sits there and buys or sells ES all day long. Those guys don't daytrade this shit. They really don't swing trade this garbage as an isolated trade idea. Seriously. They have big blocks of capital to put to work.