Filter forge has a cool Loop node that allows to make a "Slope blur" doing it not only 32 layers/samples/iterations max but whatever you want with just one node , not a stairs you have to make manually? Do somebody know a way to recreate this ?
You can't make unlimited loops in designer - it's a deliberate choice by the developers. If you wanted a 256 iteration slope blur, the best way to do it would be to use the automation toolkit to build the graph - you can use loops there