Thank you Oshyan for your inquiry...
To be honest, I have been using a 'pre-set' scene in World Machine, if you will - that provides some awesome color and masking bitmaps - but I didn't think the outcome of the final render was as realistic as I would like it to be.
I found (again, a 'preset') within Gaea that provided more realistic colors overall, and I thought that using the color maps, and masks from both builds would provide a more realistic outcome.
I guess I was looking to incorporate the 'best of both worlds'.
As this was my first attempt with this work flow, I really didn't know what to expect.
Gaea is still very new to me, and maybe you are right... I just like the 'Plant Mask', the 'Talus Mask' and others provided with World Machine and Geoglyph.