I used SD1.5 when it came out and left it alone until a few days ago. The improvements are incredible and hard to articulate.
If anyone put SD down for a good period of time, they should really give it another go. Use the full suite of options and make sure you are using a model fitted for your purpose.
That's probably because they use "clean" output from their own base models. What you get from those is a far cry from what a custom model like DreamShaper together with negative embeddings can do.