Nope. You can make cool tones with the stock cabs as well, just have to eq them to your liking. My concept was to separate the low end and to control it separately, give it a different character, make it less mushy.
By the time my tone structure have changed a bit, i swapped the Ampeg block with a compressor and an eq block, everything is running through a Zilla Fatboy 2x12 and it sounds like this:
https://youtu.be/BIUoLHpa23M