The Hyperion simply can't rely on its puny armor and speed is meaningless at point blank range.
Who said you needed to get into point blank range? You have medium energy slots, and missile slots, you don't need to get into point blank range.
You already have a risk when using the teleporter, if you teleport yourself into combat you are at risk,
Why would you teleport yourself into combat instead of burning your engines for a few more seconds? Wouldn't you use it to teleport behind your enemies instead?
systems come with a cooldown timer
Yes, I'm pretty sure I've caught that by myself from the various things said around this thread.
using it to move in behind an onslaught and being unable to get away instantly is a big risk all of its own.
Yes it's risky, especially without the shields. But it's not an impossible move to teleport behind your enemy and let loose, no? If it's not impossible, then it doesn't
limit the teleporter to an escape system, does it?
Also, it doesn't specifically need to be an Onslaught. It could just be a Dominator, an Eagle, or so on. There are plenty of ships that have very poor rear guns, worse than the Onslaught.