Saying that Wing Tsun doesn't have long range (or ground) game is silly. This just shows certain practitioners lack of understanding and application, their Sifu's lack of ability to teach, or their very flawed training methods.

Either you can fight, or you can't. Period.

No concact
Kicking range
Punching range
Trapping/clinch/stand up grappling range
Ground defense

We have an answer for all of that.

I've seen a lot of schools that don't spar and only Chi Sao. They don't mingle with other schools/lineages and they don't cross train with other arts. Therefore they are only functional at that one range that they train. It's not that the system doesn't have it, it's that they don't have it.