"The RTX 3060 packs a 50% larger frame buffer with 12 GB opposed to 8 GB, so it should handle future HD texture packs a lot better, meaning future AAA titles could potentially look better without hurting frame rate performance. In our opinion, that's a nice bonus that shouldn't be overlooked.
The RTX 3060 also packs a full x16 PCIe 4.0 connection whereas the 6600 XT is cut down to just 8 lanes, and this can cause serious performance issues when exceeding the memory buffer. That's another reason why the memory subsystem of the RTX 3060 is vastly superior."
Pretty much irrelevant, as the charts don't show any effect of this. You may as well say the 3060 would be even more of an expensive dog without these features.