Border line to use kicks instead of punches changes.
Bigger size = bigger soft pressure points bigger target
natural ability to deliver and take more and deliver more impact force
natural ability to deliver and take more push and pull force.
body mechanics of correct sequential execution of techniques contribute to maximizing the forces of impact and push and pull.
Longer arms moving over longer distance take longer time to complete that distance and require additional explosive force to compensate for it. Naturally someone with longer arm, has or will develop the required force up to a limit.
You can have great hand eye coordination, but can you catch a fly with your two fingers each and every time? This has to do with man reaction time vs. fly reaction time.
Overall tactical entry to the hot zone to ensure maintaining the element of surprise leading to victory might change a little bit. Obviously the body mechanics should be maximized by following the most efficient sequences, and also the tactical entry into the hot zone should be maximized as well.
If you consider boxing, you would think longer reach has an advantage as hypothetically when both opponents move in, one can hit the other without the other getting close into punching range, however that first punch could be deflected, and the shorter reach boxer can then get closer for a hitting range.
A block kick however to the knee leaning backwards could stop a boxer from getting into hitting range. Generally, in self defense, you would start on the longer range and therefore when facing someone with longer legs, you might want to estimate his reach and know at what point to start your deflection and counter attack.
When it comes to the grappling range, in Pure Krav Maga you would look for a soft pressure point anyway. However if someone is trying to get you in a headlock, and your neck is too small for his arms, you might find it easier to slip out.
That understanding can ensure seeing the greater picture and overall control of the training process and fighting purpose to victory.