Taiwan has the assistance of twenty seven navies patrolling the East and South China seas
As seen in the Black Sea, surface ships are easy targets when patrolling near land based air power, anti-ship missiles and drones, and semi-submersible drones.
Being an island, Taiwan can only be supplied in bulk by sea. Surface ships, including warships, have never been more vulnerable. And what kind of civilian frieghter is going to risk running a Chinese blockade?
Ukraine, on the other hand, is the size of Texas and has land borders on its western side far, far away from the ground combat in the east, over which military supplies can easily be shipped. So in terms of allied military support, that is quite an important difference.
Also, yes Ukraine survives at least for now. But any talk of this success should also mention the enormous cost paid by Ukraine in loss of life, injuries, infrastructure, economics… to end up in even the current position where the future remains quite bleak for them. So I really do not imagine the average Taiwanese wants to end up like that. Anyway, I think the idea of a Normandy-style invasion is fanciful. I expect the approach to be much more clever than that.