what would be a better SoC instead of the t210 in your opinion?

Better support. Qualcomm doesn't support low-level API Graphics. Nvidia has years of experience in it.
You can laugh, but without low-level API, you will get more shitty graphics on this sd835 than Tegra X1. Fortnite looks better on Switch than SD845, but SD845 has 60 FPS.

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And about my opinion what would be better - next SoC from Nvidia with LPDDR5. Samsung has just started production of LPDDR5 chips, so after two years Nvidia should make SoC that will be many times better than t210 IMO.

 

This exploit was unknown to the release of Nintendo Switch. Noone had any usage of it, because every device using Tegra X1 has access to non-signed RCM or it was using Bootloader that allows installing custom firmware.
You don't know if something like this is not in SD835 or SD845, because noone has any big merit of it.