This may be a stupid question ("why not eat cake instead") but why not install LineageOS on it? It's a clean Android and it's utterly well supported on the Pix

This may be a stupid question ("why not eat cake instead") but why not install LineageOS on it? It's a clean Android and it's utterly well supported on the Pixel line of phones. Google only supports these phones for a few years. That is useless to me, who intend to use my tools for much longer than that. LineageOS has provided that support with a minimum of fuss.