As far as I know, the problem is that Lenovo doesn’t make the SOCs that actually implement the security features GrapheneOS requires; Qualcomm does (assuming this phone uses a Snapdragon chip - I didn’t check). And Qualcomm only puts these security features into the most powerful SOCs, which are themselves only appropriate for flagship phones.

I hope that some day more budget SOCs will get these security features too so that more people can reap the benefits, and I hope Graphene is pushing for this too, but I don’t think we’ll see it any time soon.

the CIA is behind it. they don't want the masses (= poors) to be able to talk privately and maybe organize a significant political change or sth. it's all about keeping the possibility for mass-surveillance open.

technically, it would be trivial to add a TPM chip to every SoC. that would literally cost less than $10 per chip; maybe they wouldn't have to add a chip at all but could do it all in firmware already, depending on how the exact boot mechanism works. there is clearly no technical reason for not doing it; the reason why SoC makers don't add it has to be because of ideological decisions.

There's a lot that Qualcomm could do better support-wise