It appears that some of the younger members are not quite familiar with the balance of military power across Taiwan Strait merely a quarter century ago. That ROC/Taiwan had considerable air superiority and naval superiority (excluding conventional submarines and very noisy nuclear submarines) over mainland China was pretty obvious for anyone who cared to known such things back then. Such balance of power sustained at least towards the end 1990's if not early 2000. In fact, Taiwan's defense spending was not surpassed by that of mainland China until around late '90s, IIRC.
Another way to remind people how backward PLAN was back then, check out history of the Sino-Vietnam naval skirmish around Spratly Islands in 1988 (Johnson South Reef Skirmish) and see how outmatched PLAN warships were by South Vietnam ones.
Taiwan had one of the most powerful air force and navy in Asia back then. In fact, even today, Taiwan's air force and navy are still one of the more powerful ones in the world relative to its population. It's just that they are vastly overshadowed by Chinese military now in every aspect. Of course, this is nothing extraordinary - China was simply too backward then. History just regresses to mean.