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secrec We don't know anything about the 10 and how the future SoCs will turn out.
TSMC is not some magic thing that is sufficient to make a great SoC. Their process nodes are the most efficient right now, but that does not explain alone why custom Qualcomm/Apple cores perform better than ARM Cortex cores. The key information here is rather that Google will make their own custom cores based on the ARM ISA. We don't know if MTE will get the same kind of support that the current Tensor provides.
Samsung's 4LPP+ process isn't regarded as mediocre, and that's what G4 will use along with a new core configuration and updated Cortex cores. I think most people will be pleased by a more efficient SoC. It'd be great if Tensor could offer the same level of raw performance as the latest Apple Silicon SoCs, so here's hoping Google eventually catches up with their custom design, but they may also not.