I'm completely with you. Although I'm not a tumbler I really like seeing this amazing allstar tumbling and I'd really love to see more gyms over here. To answer your question I'd say that there are several goals that should be attained with the rulebook. One of these goals certainly is to increase the skill level in cheerleading. To do so it is necessary in my opinion to have quality gyms with well trained personal. Financing such a gym is not easy and you cannot waste your time and money practicing skills (or providing the equipment) that are nearly of no use at competition. So yes, to have great tumbling, you have to have a balanced scoresheet.
Other goals of a rulebook are e.g. make the sport safe, make it fun, make it interesting so that people want to get involved in the sport and give the athletes a system that offers him opportunities to be successful at different stages of his/her personal development. Having an age grid and a skills level system does provide these opportunities. So why not have a division that offers winning opportunites at worlds for teams that come from countries where cheerleaders mostly don't have access to good gyms? It has been said in another post that there are no athletes from Africa compete at winter olympics, because they don't have "access" to snow and it no one would ever have the idea of creating a special division for Africa at e.g. skiing. That's right. But that same sport has different competitions for different skills: downhill and slalom. Only a few athletes are good at both. Maybe we should have something similar, i.e. stunt oriented cheerleading and tumble oriented cheerleading as well as a combination (in skiing there's also combined).
