I think there’s a confusion between “get round” and actually being fun though.
I’d bet a Pork Pie that I, or anyone else even half competent on a bike could “get round” just about any track anywhere on a HT. That doesn’t mean mincing down a WC DH track over 20 minutes is necessarily fun though.
Trying to ride a constantly rough track that saps your speed on a HT (as opposed to a smooth track with rough bits you can pinball through) isn’t always fun whereas it may well be on a FS which carries it’s speed over the rough surface.
As for “features”. Unless the surface is rough, a jump/drop doesn’t really benefit from suspension, just look at BMX’s, tiny wheels and no suspension. ‘I could ride A-line at Whistler on a HT’ would for example be less of a brag (IMO) than ‘I rode Cavedale at 10/10ths on a HT without taking the chicken lines on the grass’.