Blurring HDRI maps in Blender 2.8 EEVEE How to blur HDRI images set to the environment? There is no definite way, I see many posts on the internet being quite misleading, like how to do it in compositing but it doesn't seem like it quite works.

In Cinema 4D, every texture you set to an material then to an environment object (sky) has a defaulted blur parameter, so you can "easily blur an HDRI" even though in theory you're blurring a material's texture.

I tried looking at compositing, film, with some tuts saying to do the work in compositing tab. Can anyone give me a definite 2019 answer to how to blur hdri environments directly inside blender? Without going to Photoshop I mean.
If you need the to render a Blurry HDRI, Try with Depth of Field.
But, if you need to blur de HDRI for the reflection, then use roughness inside the materials that you want to blur.

Hope that helps.

Good Luck