In my mind (totally un-scientifically validated though) there needs to be mass it the interface of the stylus and the record (e.g. the platter) to minimize any micro resonances that could distort that tiny signal.

Next, mass or non-resonant chacteristics in the plinth and suspension are needed to minimize larger vibrations affecting the signal.

Thirdly, mass in the stand is needed to minimize air-born and floor transmitted vibrations.

You are correct, that ideally you need all 3 to be optimal if you are using a mass loaded design.

There is of course the other camp, using rigid and light designs.

Next, mass or non-resonant chacteristics in the plinth and suspension are needed to minimize larger vibrations affecting the signal.

Thirdly, mass in the stand is needed to minimize air-born and floor transmitted vibrations.

You are correct, that ideally you need all 3 to be optimal if you are using a mass loaded design.

There is of course the other camp, using rigid and light designs.