You are sorta right, but I think for the wrong reason. Yes, actually specifically training for a venue DOES make the training more appropriate and therefore more likely to succeed. "If."
IF it's the right training and that training actually addresses things which are specific to that venue. There are some generalities such as strength and cardio fitness. But training in punching, kicking, takedowns, and groundwork is going to be very limited value if you're part of a 5-man Fire Team equipped with small arms (M4, SAW, etc.) and facing groups of similarly armed people. Conversely, if you are highly trained in small-group maneuvering and tactics, with small arms but never trained anything pas MAC in basic, then you're gonna get your butt handed to you in the ring.
Yes, specific training for the venue does make you better at that venue. But just thinking you have the
right "specific training" doesn't actually make it so.
That is wrong on so many levels.
People don't know that they don't know.
Peace favor your sword,
Kirk