nope, tug is great for everything from engagement to focus, obedience, tracking, protection... its a great reward if the dog likes it (mine will take a tug over food most times, unless he's starving lol).
Just keep the rules clear:
1. start and end the game on your terms
2. no resource guarding from the dog
3. dog must respect your hands and clothing
4. Out means out...
And enjoy each other's company