I hit the 40 quarters of working in the US a looong time ago, so no totalization agreement needed in my case if I renounce, as @QuaSaShao mentioned.
However, I know how the real world/bureaucracy works. I won’t renounce because I know the process of receiving my payments will be a lot smoother if I remain a citizen. While the Social Security Admin. has a few countries set up to transfer payments smoothly, Taiwan isn’t one of them.
I know of two retired dual citizens (Taiwan and US) who live in Taiwan now. The easiest way for them to receive their US Social Security while in Taiwan is to have it deposited into a US bank, and they simply withdraw it at an ATM here. “Simplicity is beauty” as my mom used to always say.