Maybe after a few years I just got used to a controller backpack more than a bulky one, so yes this is of course my experience. Having used an S4 for quite some time I also think it has loads more potential for easy setup.
Your split setup with X1s, F1 and Z1 of course has other big advantages in flexibility and expandability. The knowledge involved in your setup is higher however, if something goes wrong a seasoned player like you will have no worries to fix it, where a newer user might panic and make it worse. Also due to your experience that I read from the Intro, I am guessing you have a really good picture in your head what you want from a setup, how to achieve it and what your workflow will look like. Here in this forum most questions are asked by rather inexpirienced people and we have to ask if they really know what the intended purpose is. Simplicity is king here, as I guess we both agree they are only tools and do not make a good DJ, a good DJ is someone expressing creativity through his passion of music, no matter the tools he uses.