First, the effect in sideslip is to stabilize. Look at the diagram - he wind resistance on the exposed side of the aircraft will tend to straighten it out. I’ve experienced this, to sideslip you have to actively hold the rudder and ailerons to force it.
When banked, yes, the torque (sort of “lift”, but not vertical) is balanced. But the fuselage, and presumably most of the weight, is pulling downward (vertically) on both wings relatively equally. Because of dihedral, the level wing provides more lift to counter this than the wing pointing more upward, thus levelling the aircraft. (Same concept as trying to drag a tilted catamaran down under water, for example - the deeper side has more buoyancy, so harder to flip) Simple torque is balanced; torque against gravity is not balanced.
The danger in a bank is that the wings, dihedral or not, do not present the same horizontal component, and hence the same amount of vertical component lift, as they do in horizontal flight. This is easy to understand - bank to 90 degrees and nothing is keeping the aircraft up, it will fall sideways downward. The “lift” is pulling the aircraft toward the top of the fuselage direction, so the plane will be pulled to the side facing fuselage-up. Bank 45 degrees, and the same speed that kept you level will no longer work. You will start to fall as you turn. As anyone who takes flight training knows, when you go into a serious turn, you must push the nose upward, and increase power, to ensure that you maintain level flight in the turn.
Usually a bank is accompanied by a rudder movement to start the aircraft turning, too.
The biggest risk is a spin. At an extreme banked angle, the risk is the inside wing, going slower from being inside the turn, will “stall” or stop generating lift, before the outside wing. Then, the inevitable - the outside wing pulls the aircraft over onto its back, the tail causes the nose to point downward, and the aircraft goes into a deadly spiral downward, eventually straight down. If the propeller is powered, the torque of the engine aggravates this. If it happens too close to the ground, uncontrolled flight into terrain is the byproduct.