There will be cheaper Motorola devices with GrapheneOS support too. It's initially going to be limited to flagships due to Qualcomm not yet having MTE for a non-flagship SoC. A flagship SoC is easily more expensive than a lot of low-end phones. Pixels have a much easier time providing high security and long term updates for the budget 'a' series line because they have an in-house SoC used across their devices. Pixels also have no flagship SoC with competitive performance despite selling flagship devices using the same SoC as the lower end devices. It has drastically lower performance than a Snapdragon flagship to the point that the flagship Snapdragon will be an upgrade of ~60% to single threaded performance, ~80% to multithreaded and over 100% for GPU performance.

I'm part of the market for a premium phone that at least nods in the direction of allowing you freedom over your own device. I'm probably going to buy something from this batch of Motorola phones rather than a samsung which has got more and more user hostile over the years. And yes I might be part of a small niche, but I'm so pleased someone is finally making a premium phone that appeals to me.

There is a market for a phone running GrapheneOS (that arent pixels) in general, and a wider range of devices can be supported in the future, once the needed hardware security features are implemented in them.

I just want to buy a pretty good new phone that supports graphene, doesn't need to have 5 cameras, 2 is probably fine.

Same. A lot of voices saying "I would totally buy..." and then an excuse comes up when it's time to actually buy. (no shade, I've been guilty of this myself)