It's defective by design simply because putting an antenna into contact with human skin - especially an antenna designed to transmit/receive microwave frequencies which is where all modern cell phones operate - is going to cause dramatic signal attenuation and loss, period.
That is a scientifically provable fact that none of you is going to be able to disprove, sorry.
Show me one other device, of any kind that uses an antenna for signal reception and transmission, made by any manufacturer, that works better by allowing human contact with the antenna or is specifically designed to enhance signal reception/transmission because of that contact.
Come on, show me.
Any antenna engineer or anyone that deals with not only communications equipment in general but more specifically microwave reception/transmission hardware is going to laugh you out of whatever box you're keeping yourselves locked inside with such ludicrous concepts.
Antennas just don't work that way, they never have, they never will. Hence:
Defective by design...