If you’re interested, my sketchbook has some examples of textures for animated water, with breakdowns. It’s not PBR, but might help since it’s using tiled textures.
I want to know that, because I am searching multiple sites and basically 0. So I bother to do them from photos and them seamless tile them, but still,... I don't want to do them in 1 software with tons of procedurals. I want it to be portable textures.
It's like asking why there's no good road PBR textures, water shaders have so many different requirements and needs and layers that no one size fits all solution is going to exist. Same with roads, terrain, grass, etc.
i must have a dozen different pbr water shaders for unreal. Rivers, oceans, ponds... every type of water. All from different authors. as mentioned, of course you can transport the textures anywhere you want but the shader itself is always dependent on the language / engine.