Are you saying the author needs to verify that all the plugins built so far are compatible with their own new undertaking, for this to remain True Scotsman TW?
I think it's just a basic question about the tradeoff, if any. It's not that the author needs to verify or support compatibility with TW plug-ins, but it's worth asking because plug-ins provide a value add that's orthogonal to the value add of making TW a PWA.