Hmm, not sure I agree with all that really. In 2000 the T4 engine never had VNT/variable oil pump/variable coolant pump/ secondary micro cooling circuit/DPF/SCR/twin cams/ 4 valve per cylinder and they'd barely got into direct injection.Basically - modern gearboxes are smaller/lighter/cheaper as a result of not having to manage the undamped vibration coming from the engine.
My mate has a solid flywheel in his 1.9 Sharan and it's been fine, I wouldn't put a solid flywheel in my tuned T5 2.5 though.I have one in my 1.9 t30 and had it for last 30k miles. Only downside for it is the extra rattling sound when in neutral. Apart from that I didn’t broke my gearbox or something related to it up until now.