Could you say more about which extensions you’re referring to? I’ve often heard this take, but found details vague and practical comparisons hard to find.
Not the same commenter, but I’d guess: enabling some features for bindless textures and also vk 1.3 dynamic rendering to skip renderpass and framebuffer juggling
The last one has profound effects for concurrency, because it means you don’t have to serialize texture reads between SAMPLED and STORAGE.