Yeah, here’s the reason: DICE keeps forgetting Showdown exists even though it’s the superior Hero mode.
Sadly it makes the playerbase forget about it too when they learn that there’s less maps to play on.
Y’know, originally Showdown was only on one map: Jabba’s Palace.
It got old like that really fast.
We're adding Ajan Kloss to Hero Showdown, so not forgotten about it.