It depends on the car. If the car had 300,000 miles and everything was out of spec, I would agree with you. Many of these replacement parts are not quite what the OEM ones are, even the better brands. If you replace everything at the same time, you may have a difficult time restoring that OEM suspension experience to troubleshoot what is causing wobble or vibration.

As your car gets knocked out of alignment multiple times, that wisdom can be questioned.

Dkr.