Pixel 2 and 2 XL have been marked as legacy devices to reflect that this is the final year of guaranteed support. These devices are missing some newer hardware (Titan M) and kernel (CFI, ShadowCallStack, etc.) security features but they've aged much better than past generations.
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Pixel 2 and 2 XL are still supported. The only change is marking them as legacy. Please read the device support section in the FAQ: grapheneos.org/faq#device-sup. You have some misunderstandings that are addressed there. I would have recommended reading it before purchasing a device.
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It also says "The recommended devices with the best hardware, firmware and software security along with the longest future support time are the Pixel 3a, Pixel 3a XL, Pixel 3 and Pixel 3 XL." and explains why older devices eventually need to be dropped: grapheneos.org/faq#legacy-dev.