Cadaverous Clash right? Right, so it will be either Undead or Fiends since the game likes to swap around enemies dealing the same type of damage around in Clockwork Tunnels/Arenas. So, since there are arsenal stations put in the game who needs 2 weapons slots, right? Right. So lets go with Barbarous Thorn Blade instead of Divine Avenger as they both work well on both enemy types but BTB is better at Fiends who provide more danger and Polaris for the Mechaknights and turrets, got covered all that i can meet, haha, so easy. Damn, arsenal stations made the game so easy. As for the armor and helmet i'll just equip the Snarb Cap and Vog Cub Coat, use Crest of Almire as my shield, get one Elite Quick Strike Module (because i'm really attached to VH ASI and can't stand it being higer or lower than that) and one Elite Trueshot Module to comply my Polaris. What could possibly go wrong, right? All set then, lets kick this party off!
(10 minutes later)
Whoop, whoop, so easy, haha oh wow. Lets enter this 3rd subarena. All goes well, then comes the 8 turrets spawn - when i saw that, i couldn't believe my own eyes; is it an illusion? Did the game mistakingly loadthe wrong models? It has to be, here i come with my BTB and wow, i do only grey numbers. No, this can't be possible... no... they are real. The horror that has spawned to my surprise, was real. It was no illusion. In the confusion and the awful visibility of the battlefield i had fallen. Remember kids, evil can spawn all kinds of evil especially when you are being too careless and delusional about Arsenal Stations making the game easier and rendering weapon slots and armor mixing useless.
TL;DR
Game adjustments will be made accordingly to any significant change (this time its Arsenal Stations) so stuff like difficulty will be still there, just in a form of a nasty surprise (another example: Thunder Fist Arena - Robo Rampage had Quicksilvers spawn) so its safe to assume that monster spawns will be corelated to the monster theme and also status theme (Polars on Ice Maul Arena: Cadaverous Clash and Quicksilvers on Thunder Fist Arena: Robo Rampage) so no, weapon slots aren't useless and mixing armors is certainly viable.
Turrets always get mixed. Even before the arsenal update.