Yep. And actually that's exactly what KPM said:
I think he makes a very good point here. I don't find that grappling conflicts with my stand-up art of WC at all. My PCE/Latosa Escrima also works well with my WC, but some other FMAs I've trained did not. Two very different striking arts that have conflicting methods can be a problem. As KPM said, you don't want to have to decide between too many different ways of doing things when the pressure is on.
I agree with the last bit, my issue was with the first bit.
Nothing wrong with this. But the two have a different biomechanic. Shifting back and forth between 2 different biomechanics can be confusing...
KPM appeared to assume, and I may have misread, that FMA was in a way universal and that part of that was a biomechanical incompatibility in terms of stand up striking. In my experience, it is quite easily to flow between L-I Kali and WC, they are very complimentary. Now I think part of this may come from the fact that, in reality, there are at least as many, if not more, styles of FMA than there are CMA. I have also found, from talking to more than a few Wing Chun Practitioners, that while my circumstance is uncommon (both taught in the same 90+ minute class) that studying and mixing both is not uncommon in the least.
In my experience I see a lot of similarities, at least with my Kali. While Kali may emphasize checking/tapping more than trapping, Kali still has a fair amount of trapping, the methods between the two are very similar, it's simply a matter of prioritization. I would even perhaps call hubud a "poor" man's chi sau, in some ways as well as it is trying to train some of the same concepts.
The only difference of real substance that I find is the footwork in Kali can be a lot more dynamic, but that really only comes forth full force when you are training with weapons in largo (well you need to step more if a sword or stick is coming at your head
) but the footwork itself changes as you pass back and forth between largo, medio and corto. So once you are in corto it isn't much different than my WC, it's small steps trying to get out of my opponent's centerline of attack so I can attack his center from a blindside/flank.
Now as I said, not all FMA's are the same. Mine is admittedly a hybrid and while it's takes checking and trapping from FMA and Silat, it also takes a more linear path to these goals, I suspect due to the influence of Kuntao which has it's origins in Southern CMA (Silat tends to be more circular). To illustrate the difference there is actually a video from back in the 70's, that i sadly lost. It showed Suro Mike Inay and Guro Dan Inosanto flow sparring with empty hands. Guro Dan was very linear and direct where as Suro Mike used more oblique attacks. Both were clearly effective, but Guro Dan's was also clearly more compatible with WC.
So, tl;dr,
@KPM I totally agree with your last point, as to the first point, mileage may vary due to the plethora of FMA styles, both born in the Home Country and then compounded by some of the styles that were developed/refined in the States.