Yes, Heddels has gone massively down hill and not just in terms of only featuring Indonesian fades.
Something I would like to point out is the fact that Indonesia is still earlier on in their raw denim journey. I would imagine that in a few more years, the horizons will broaden. Perhaps not, but sikk fadez were seemingly the only thing that mattered in the western denim scene for quite some time as well. Also, we are only seeing what is likely not their entire scene. Perhaps there are some who do prefer different fades and styles, but we're only seeing what is submitted to Heddels. My guess is that this would be a very tiny minority, but it still could exist.
In terms of denim fabrics, washing, fading, etc, there is definitely variety here. However, in terms of style, I would argue otherwise. I may get hate for this, but to me, the style in WAYWT is kinda basic boots, t shirt, flannel look and often streetwear-esque due to the proliferation of sneakers, Red Wing, and Viberg. Although, I will say that it has gotten more diverse, especially in 2018 which is really nice. Denimbro is not as coal miner as it used to be, but that place is dead anyway and really has been for quite some time. The elitist snobbery really went too far during the final Denimbro and it hasn't gotten any better since. Instagram was my least favorite in terms of aesthetic until I found some dudes with some really good style that don't just do the standard IG thing. Skinny jeans made by some random brand that will be dead in a year, 3Sixteen shirts and jackets, Chup socks, and boots from Truman and Red Wing are all you need. Still, the general quality of photo is better on there and the community is the only one that has really made me friends in real life (aside from @itsbenhere ) so I like it anyway.
I actually really dig the Sandlot look, personally. I wear sneakers a lot now, even if I don't take pictures of them as much. I don't even know what my style is exactly. Probably "late 1940's wannabe" and I'm just fine with that. I'm happy to cosplay because I know that I, not anyone else, will ever actually look or be as cool as @volvo240thebest is.