There’s also the excellent Nomad Sculpt, which while not a mesh editor, is an incredibly performant digital sculpting app. Compared to Blender’s sculpt workflow it maintains a higher frame rate and smaller memory footprint with a higher vertex count. Of course it’s much more limited than Blender but its sculpting workflow is much better and then you can export to Blender.

There is room for more than one modeling app on iOS as long as you can offer something that Blender doesn’t, even if it’s just better performance.