I don't think competition necessarily means your WT/VT/WC will suffer.
We train a fighting art, so you have to fight with it at some point in order to test what you're doing. (unless you train purely for the love of the art and don't care one way or the other if it works for you/if you can make it work, in a fight... which is cool too - some people just love to practice a given art for nothing more than the sake of it)
We know that the likes of Sum Nung and Yeun Kay San accepted challenge matches, Yip Man exchanged with other Wing Chunners (and I'm sure there was a competitive edge to that - it's human nature).
People are competitive creatures
I spar, but I don't compete in competitions - the sparring is a learning tool and also has that competitive edge to it.
My only concern with people in our art sparring is that I think many approach it too early. I think there should be a transition from isolated partner drills and pad and bag work, to Chi Sau and Lat Sau, and
then to sparring.
Otherwise it is hard/difficult to spar while keeping to the art (its concepts, its body methods, strategies, etc).
For sure, what I think is the correct methodology is
not the fastest way to train in a live environment. Taking boxing lessons or joining a MMA class will get you there quicker (if that's where you're looking to get)