Honestly I feel this is a stupid move. If they allowed iPhone to tether ONLY to iPad and vice versa they could build up their user bases for each product. People who buy iPad would be more likely to buy an iPhone, and people who have an iPhone would be more likely to buy an iPad.
Of course, if they did allow that people would still bash them for not allowing tethering to any device or phone.
Of course, if they did allow that people would still bash them for not allowing tethering to any device or phone.