I haven't seem anyone respond in the way you're complaining about.

There's a long list of requirements, with a big one being hardware memory tagging.

https://www.techtimes.com/articles/325679/20260826/grapheneos-expands-motorola-better-snapdragon-radio-isolation-google-pixel.htm

The Snapdragon 8 Elite Gen 5 — the chip inside the 2026 Motorola Signature — introduced MTE support, but only in the Elite variant. The Foundation has characterized MTE in the non-Elite Snapdragon 8 Gen 5 as effectively broken for GrapheneOS's purposes. This is why even Motorola's current flagship lineup cannot qualify: the chip is close but the specific hardware feature GrapheneOS treats as non-negotiable is not reliably present across the Snapdragon lineup.