Tires are only part of the traction equation. Of course, correct tire pressure is super important for preventing heat build-up, having the correct contact patch, and proper flex. Tire temperature is also important. At high temperatures, the rubber can degrade and leach oil (tire got greasy). When cold, the rubber becomes hard and doesn't conform to the peaks and valleys in the road. Tires also become harder with age. The tire profile and size also influence traction.
But road conditions (concrete, asphalt, rain grooves, etc.) also influence traction, as does the suspension of the bike. When braking, most of the load is on the front wheel, and when accelerating, most of the load is on the rear wheel. The lean angle also affects traction. But the lean angle of the bike can be reduced by hanging off, which changes the center of gravity of the bike.
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