I instinctively just argue that a very bass-heavy kick
would crowd out the track too much, overshadowing all the other stuff in the track.
It's exactly this - goa is very dense in terms of sonic content (layers and frequencies) therefore very heavy and long kick would steal of lot of space to other sounds. In the past a lot of Israeli goa featured quite heavy, boomy kicks (e.g. Oforia) but it had to compensate by using a bit weaker, more mid-range focused bass line.
Also, I'd argue if your friends even understand what they mean by 'more heavy'. Goa/Psy kicks are usually very bass-heavy, with just a very short click at the beginning and are extremely short (to make room for machine-gun bassline ), so probably what they're refering to is length?
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