Is there a fallback for VK when VK_EXT_descriptor_indexing is missing?

[sDeemm]

Hello, I'm targeting mobile devices where I want Vulkan to be the primary backend. The README states that VK_EXT_descriptor_indexing is required. It seems that this extension does not have a good coverage (<27%) on Android (source: https://vulkan.gpuinfo.org/). am I right to assume that VK will fail for those and therefore need to use a OpenGLES backend or there's alternative/fallback in the VK backend so it'll work but it's up to the user to not use descriptor indexing.