I guess that was the point to me. You see it at the resorts too - I think some parents are much too lenient on letting kids into hot tubs. There are a couple of issues with that - the first is that little children that have mistakes can be problematic because of the relatively small space / amount of water in a hot tub. The second (and perhaps larger issue) is that a hot tub that is truly a hot tub can be dangerous for little kids - not just in the height of the water but that the temperature can make them dangerously ill.
Although the hot tub in the family area was smaller and not too hot, it was more or less a falsity to have it there - just make it look like a kiddy pool and admit it is one.