I don't think it is a bad, just different. Kissing is naturally a part of sex for me. I don't want to have to constantly remember a rule that is so unnatural to me. It would ruin the mood because I would be thinking about the rule not the experience.
Can you imagine you having a nice dinner with good company. Steak, loaded baked potato, grilled asparagus and a good red wine. But you were told the rule is you must finish eating one item before moving to the next. Okay, I could do that, but it would be kind of boring. And as I got into the meal and was enjoying the conversation, it would be too easy to become distracted and forget about the rule and reach over and get a sip of wine or bite of asparagus before I had finished my potato. I don't want to think so much about HOW I eat my meal as I want to enjoy it and my guest.
I do think there are stupid rules. They are the ones you have no reasoning for or you cannot or will not abide by it after you have made it.
DO I think "no kissing" is a stupid rule? For us, yes. For another couple, no, not if they have a good reason for it and they don't start breaking it themselves and then get mad at me for it.
And regardless if I think it is a stupid rule or not, I must abide by it or not put myself in that situation. Everyone has the right to think a rule is stupid, just not the right to break it because they think so.