Shivan
I know we go round and round sometimes on the glock vrs hk debate.
Yes practice and some level of skill are very important. Equipment is a factor too, although to a lesser extent. If your a competition shooter and are competing against those of equal or greater skill, every advantage is to your benifit. A 10th to a full second gained on each stage is the difference between 10th and 1st place.
When you are fighting your equipment or compensating for your equipment you are at a disavantage. It is easy to say just get a good high grip, but that is not always possible. When you shoot "slow fire" at a traditional shooting rane then you can practice your perfect stance and grip. When you shoot competition where you speed draw from holster, shoot while on the move, strong hand weak hand only, or from prone postion things just come apart. Shooting a high bore axis HK weak hand only while leaning around a baricade is much more difficult than with a glock, cleaning a plate rack at speed is also a bit slower.
Equipment is no substition for skill or practice, but it is still a advantage. That can be said in every sport, and life in general.