I just don't see anything convenient about it, unless all you do is start the bike and ride it. If you frequently use the bags, it is not convenient. I still see it an unnecessary. If it were a bike that had a high likelihood of being stolen, like many Harley models, then perhaps.
As for cars having fobs, I dislike those as well. I would rather have a key, and do for my car. I dread the day I may have to have a large fob instead of a key. My key has the lock/unlock buttons on the key, and I would do away with those if I could, and simply have a key. Keys take up so much less room.
That being said, I have had no issues with KIPASS, but I see no reason for it, and prefer simplicity. Less to go wrong in long term use. I do understand why some people like the system, but for me, it was the only drawback for the bike.