I mostly just continue to use my Platinum EVA after receiving Centurion. I haven't paid for a flight in over 10 years, the EVA cobrand has probably the best mileage earn rate in Taiwan when you factor in a 50% bonus for various categories like overseas charges plus the upgrade vouchers.

Platinum EVA also has free access to the Taichung Evergreen hotel fitness center + pool, available only with this cobrand card and NOT Centurion! I take my kids there all the time to swim or play squash, it's much closer than any of the Centurion partner hotels.

Also has some other benefits when flying EVA that are not offered to Centurion.

Bear in mind you can also get up to 4 Platinum cards (any flavor) along with your 3 Centurions. Every Plat + Cent member can get their own Priority Pass card, can really squeeze out some decent tangible benefits from your Taiwan Cent if you have a large family.

I believe that airport transfer is per account, so having a free Platinum off the back of your Cent will not get you extra transfers.

If you spend enough to qualify for Centurion in Taiwan and airport pickups are a big deal then consider getting the Cathay World mastercard ($20k annual fee waived if you charge around $1m/year just off memory), new Yushan Starlux world cobrand and DBS Travel card. All have low or free annual fee with a fairly modest yearly spend and will boost your overall travel benefits.