There are some cases where using only 2 colours in a gradient creates a grey zone in the middle and they would look smoother and more vibrant with a 3rd or 4th colour. A visual example can be seen here UI Gradient Generator: Make Beautiful CSS Gradients [& SVG]
Could an option be added to create more stops?
Also, is editor-gradient-presets supported in GenerateBlocks? To get around the above limitation I have tried adding my own presets, but I haven’t been able to get them to appear on GB blocks.