The issues around training diffusion models are well known among researchers. They're likely to not be feasibly scalable far beyond the 26B size of DiffusionGemma itself, and their lower quality compared to an equally-sized auto-regressive model (the usual one-token-at-a-time flow) is also a matter of broad consensus.
> They're likely to not be feasibly scalable far beyond the 26B size of DiffusionGemma itself
I think people used to say the same about the 8B text-diffusion models too when they came out, like LLaDA. LLaDA2.0 seemingly claims 100B total / 6.1B active MoE diffusion (DiffusionGemma is also MoE). Not saying you're wrong about the current consensus, but it has a way of changing over time, might be a bit early to claim it's infeasible to scale them, especially considering the final artifact being much more suitable for local usage.