If you have unlimited room to run, and you don't care how long it takes, you can in fact use superior speed to kite indefinitely. The enemy will get one OA if you start in melee range, but they'll never get a second one.In other words, the foe gets to Opportunity Attack you every other round when they've caught up before you run. That's not "unbeatable" kite, just "favored rate of exchange" kite.
Say you're a wood elf fighting a human. On your turn, you Dash away from the enemy, moving 70 feet. The enemy Dashes toward you, moving 60 feet. End result: You're 10 feet farther apart than when you started.
Repeat until the gap is at least 35 feet. Then, instead of Dashing, shoot your longbow and move 35 feet. You are now 70 feet away. The enemy Dashes toward you, moving 60 feet; the gap drops back down to 10 feet, but they're still not close enough for a melee attack. Wash, rinse, repeat. As long as you have time and space to run, the human will never get close enough for an OA.
In practice, you won't be able to do this very often. You will usually suffer from some combination of a) limited space, b) limited time, c) enemy ranged attacks, or d) slow teammates, any of which can prevent you from playing Kitemaster. But in ideal circumstances, it is possible.
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