This V8 argument still baffles me. Sure, it was solid but it's an old designed engine. At certain point, toyota needs to innovate and can't just stay stale. I didn't own/drove the 200 series but owned a 2020 GX460, which is also a V8 and it was fine but the power (i know it's not a direct comparison) is lacking. The torque you get on the 600 and especially on the 700 is definitely a welcome change. Even the 460 V8 had issues in the early stages.
However, we do need to complain and let the dealer knows what we see, so that toyota is aware. Additionally, it's not like toyota is not willing to fix the issues. They are willing to replace the whole engine on the 600s.
With that said, I don't disagree that the 200 engine is a great engine but it's in the pass. I don't even think that the rest of the world has a V8 option for the 600/700, which tells you that they are moving away from it.