Interactables are for almost everything. Protection, zoning, combos and escape. They're not at fault when someone doesn't think of taking advantage of them, when something from any character's powers do not work at all. Raiden, Ermac, Scorpion, Jason and Takeda are characters that have the ability of the teleport, so why would they need the interactables at all? Those who have air escape, like Kitana and Raiden, have a way to get out without using teleports and interactables. What of those who have no teleport, no air escape, etc abilities, like Jax and Johnny? They would need Interactables to compensate for this. IMO, it'd be a nightmare without interactables. I like seeing and using new stuff, like the Interactables in MKX, to improve my fighting gameplay there.
MKX has everything, and would have been the best fighting game, if some people, like Paulo, in NRS were seriously smacking their heads on their offices into learning of how to properly balance and fix everything. ASW is the best company regarding the balance (GG, Dragonball, etc). Thanks to this mess INJ2 and MKX were in, I don't know if I'll have to take them seriously. NRS need to take us seriously and listen to what we might have found and what would improve the balance game. Thanks to what happened there, we learned NRS's "Taketh and Giveth" mind game, and this is why almost everyone stopped suggesting buffs and nerfs, because we know that they're up to no good.