my point is that CPFP is not a negative. (countering dannys 'bad idea') opinion.. but its not a guaranteed 100% double spend cure either. some merchants wont bother or care for CPFP, bt sometimes some trades are time sensitive
Now I see your point and agree with it, though not because this feature can help prevent double-spends. If it does actually facilitate transactions (by shortening confirmation times), then it just can't be "bad"...
Unless there are other hidden drawbacks that might outweigh its usefulness, of course