Taiwan won't be easy for the PRC. Normandy was close to the south coast of England and the Luftwaffe was cooked by the combined air offensive but it was still very hard to land and get ashore. Taiwan would be a tougher nut because of advanced weapons and bad conditions for the invader.
Taiwan has a very, weird weather pattern and very few good beaches. The Atlantic hurricane season is chaotic for the US; but the western Pacific tropical cyclone season is murder for the east coast of China, the South China Sea and Taiwan.
Landing on the west coast of Taiwan is channelized in only a few possible places. Tactical airborne landings are murder in any environment where shoulder fired SAMs exist. Note how hard it was for the Russian elite forces to take Hostumel Airport: they didn't.
Now the US has been working fast to integrate some very advanced and effective systems such as the Typhon, Rapid Dragon, AIM-260 which will meet or beat similar advances for the PRC. China is seeing the importance of swarm AI with drones which the US leads in development of but they have a lot of tech advantages in as well.
The war would be bloody and expensive. If we can keep our alliances we can and should win but I do not like to contemplate the costs. This is a very good essay on the subject:
https://www.usni.org/magazines/proceedings/2024/september/no-one-should-think-war-will-be-short
and the author discusses it here