TMIC: Why remove the engine cover?

[Ashtone]

Why does everyone remove their engine cover? I would think it was designed to make a tighter seal for the TMIC to receive cooler outside air though the hood scoop. 
I know that an open air filter element inside the engine compartment draws hot air, which defeats the purpose (unless you provide a heat baffle and a cold air source). Isn’t this engine cover seal the same thing? If it’s not there, isn’t the top mount intercooler getting a lot of hot air from the engine?
Maybe aftermarket TMIC’s are larger than oem IC’s so it won’t fit, but why take it out if you’re running the stock IC?

[Max Capacity]

I took mine off a couple of days after buying the car, to see what was under there, June 28 2004. While doing that, I lost one of the plastic clips. I never put the cover back on. In fact, I have the one from my 09 Spec B in the basement. I took it off after buying that car too.

 

I'd rather open the hood and quickly scan the engine for issues. With that cover on, I can't see any possible issues before something bad happens. 

 

Many years ago, there was/is a thread where we talked about this.

 

Here's what you want to do.

 

[Max Capacity]

Now the under engine cover, you want to leave on, it helps air flow while driving by making a low pressure area under/behind the engine.