It comes down to where you want to draw the line. Every single morph can be defined as a defect. I mean why would you breed albinos? They have defective melanin production. Ball pythons could all be defective compared to an Angolan python, so why breed ball pythons at all? It is all opinion based.
Personally for me, I draw the line at pain/distress. If the animal can thrive comfortably, I don't see the issue. If there was a similar morph that didn't have issues, I'm sure it would take the hobby by storm. However that isn't the case and that spider pattern is a very desirable trait.
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