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Epoxy adheres really well to epoxy. Some manufacturers mold lugs with "new" epoxy prepreg over a cured tube - which is really similar to repair. So lots of value in considering repair for epoxy. For TP, there simply has not been that many bikes made so little effort in repair specifically for TP bikes. And, it depends on the thermoplastic used. Variations of Nylon have been most used, and there are adhesives that work well with Nylon. Some people are looking into reheating the area, remelting the tube's TP, then "welding" a patch to the repair area. But no one...

One thing missing here is the fact that with the proliferation of composite know how, there are more people around able to safely repair a wider range of issues. Rather than pretending we are recycling carbon bikes I’d love to see more frames designed in ways that facilitate repair. Repair is verifiable in a way that recycling is not, it is cost effective for everyone concerned, and it is as close as you’ll get to good for the environment. It probably flows on to other design decisions to ensure repair is viable (like bearing placement, etc etc), but designing bikes...