I think strictly speaking the tech guy might have been correct. In nested sequences, the audio track takes its waveform properties from the original clip, so if you want to edit the waveform, in theory you should go back to the original clip that shows the waveform and do your sound editing there. In reality that's not what most people want, as you often need to perform some additional sound editing in a nested sequence, after the clips have been spliced, cut and rearranged, so we still need the waveform to be visible. That's why the "Render" option is there, but it's worth keeping in mind that once you "Render" you effectively separate the nested sequence's sound clip from its original source, meaning if you later make any global changes to the source audio (say, change the volume) the change won't be reflected in your nested sequence, so you'll need to go into each and every individual rendered clip to make those changes (though of course there are ways of applying properties to multiple clips). So the Render solution needs to be used carefully and with full knowledge of what it entails, as it's not reversible once the project is saved.
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