This tool is maybe useful if you want to learn Python, in particular Blender Python API basics, I don't really see other usage of this. All examples given are extremely simple to do; please don't use a tool like this, because it takes your prompt and generates the most bland version of it possible. It really takes only about a day to go through some tutorials and learn how to make models like these in Blender, with solid color or some basic textures. The other thousands of days is what you would spend on creating correct topology, making an armature, animating, making more advanced shaders, creating parametric geometry nodes setups... But simple models like these you can create effortlessly, and those will be YOUR models, the way (roughly, of course) how you imagined them. After a few weeks you're probably going to model them faster than the time it takes for prompt engineering. By that time your imagination, skill in Blender and understanding of 3D technicalities will improve, and it will keep improving moving onward. And what will you learn using this AI?
I think meshy.ai is much more promising, but still I think I'd only consider using it if I wanted to convert photo/render into a mesh with a texture properly positioned onto it, to then refine the mesh by sculpting - and sculpting is one of my weakest skills in Blender. BTW I made a test showcasing how meshy.ai works: https://blender.stackexchange.com/a/319797/60486