Yes, always replace shocks, springs, bushes, brakes etc in axle pairs. A new shock absorber or spring will work better than an old one and can upset the balance of the car and effect tyre wear ect if you just replace the one.
Do you happen to change both front tyres even if only one is badly worn?
Do you have each shock independently set up to counter weight differences of driver/passenger and other effecting loads?
I do replace tyres in pairs to mae sure I get the same level of grip on both sides.. Its unusual for me to have one fuly worn and one part worn as they both get replaced at the same time.
The problem with changing one damper or spring at a time is obvious on an alder car but less so on a lower milage one. Drive down the road at 15-20 miles an hour and take your hands off the wheel then stand on the brake pedal. With one side changed only, the steering will pull violently to one side. Change them both and the car may still pull slightly but in comparision will be straight.
Imagine now braking hard at 70 miles an hour even with your hands on the wheel, you will get pulled to one side.
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