That area shouldn't be highly loaded
Torsion in the downtube is one of the key loads determining the dimensions of frame tubes. It's anybody's guess what's under that poorly applied filler. I'd want to be sure before riding it, but as you say it would be relatively easy to paper over the cracks with some extra layers of crabon fribé to make it safe enough.
You're right, I suppose what I meant was that it is not a common failure point. Tubes are easy to make and analyse compared to the joints and interface areas.
@chiroshi started
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Torsion in the downtube is one of the key loads determining the dimensions of frame tubes. It's anybody's guess what's under that poorly applied filler. I'd want to be sure before riding it, but as you say it would be relatively easy to paper over the cracks with some extra layers of crabon fribé to make it safe enough.