The "protective waiting period" of 24h is what kills it. For people like me, who rely more and more every day on OSS apps not necessarily in the Play Store, installing a new phone will mean waiting a full day for almighty Google to allow me to do so. It reminds me of the same annoyance of carrier phone unlocks.

I wonder how this will play out in the phones coming out of the Motorola+GrapheneOS partnership.