Usually an Irithia doesn't have to worry too much of having the enemy ship blowing right in its face thanks to its repulsor. About teleporting in an enemy too strong, in my experience the AI Exigency fleet's Irithia is always escorted by several wings and frigates. There's not much ships that can handle that much missiles for long. The Irithia isn't exactly a fragile ship either, especially with some reinforced hull mods.
I haven't tested the Irithia in a player fleet so i can't say but i know Exigency's harbingers fleets in SS+ are incredibly strong thanks to this tactic. A single Irithia can suck up a capital ship of your fleet without any chance for it to get away.