I guess the reason it’s not supported yet is because app bundles have limitations that make them not usable for all games:
- Your final app download cannot exceed 150MBs and there’s no support for expansion files at all. So if you’re working on a larger game than that it’s useless for you.
- It doesn’t support texture compression format and OpenGL API version segmentation, which is crucial for offering the best quality/performance with minimum download sizes.
I heard Google is working on addressing problem #1, as there’s a closed beta going on with some developers for some sort of “large asset” support for app bundles. What it is, how it’s supposed to work and what the size limits are, only those in the beta and Google’s developers know.
About #2, they said “we’ll support this in the future”, so who knows. It’s been two years since Vulkan debuted on Android and it’s still not possible to use it as a filter on Google Play, so I wouldn’t hold my breath.