There you go again. Making buttumptions based on ignorance. The failure was over a very short period of time. And in my case it's it's shock, singular, not shocks. Shocks do deteriorate over time, I'm probably more aware of that than you are. They can also completely fail over a short period of time. Something which you seem to be unaware of. The latter is what happened on my car. The shock on the other side, presumably having done the same mileage was perfectly OK. Manually operating it, it wasn't quite as good as one of the new ones, but if they'd both been as good, I certainly wouldn't have replaced them. The n-s one was noticeably weaker.
If you can't tell when shocks are not performing adequately, by all means take that advice. Chances are that you could be wasting money, replacing shocks that are still OK. With the admittedly slim possibility of blissfully driving on a shock that has failed prematurely, simply because you believe that having replaced it within 30k miles it must be OK. I'll carry on replacing mine when they need replacing, rather than at some figure plucked out of the air by Co's probably more interested in selling shocks, than offering sound advice. KwickFit being a good example. Mike.