Helpful to remember that while Taiwan is certainly much, much smaller, it is also mountainous and urban, with few good beaches. Some very unfavorable terrain to attack into, no matter how much you blast it first.

Their population is also quite high, that island has half the population of Ukraine, and they have money coming out of their ears.

They can make a conventional invasion extremely costly, even the old fashioned way. They wouldn’t win unaided, but they could draw it out. Just due to the defensible geography.