Pantheon's new e in comparison to Irelia's w

I've recently taken a look at pantheon's new e and immediately remembered Irelia's w nerfs. How can a champion have a mobile damaging ability get invincibility, even to true damage, but another champion who immobilises herself on ability cast (which by the way only deals damage when she stops casting) can only have physical damage reduction? I think that's it (?) bye ♡
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