A lot of people don't want to go to 4.75 Rebug because not a lot of modding tools are compatible with newly created CFW such as CCAPI, which is why I stick to 4.70 Rebug DEX as a lot of modding tools are compatible with it. Modding tools will eventually be compatible with 4.75 Rebug though but it will take some time. Another reason why others won't install 4.75 Rebug is because they want to be on the most stable CFW, which is probably 4.46 Rebug because I always hear that it's so special.
Most Rebugs are in a complete state (all stable) there is no point staying behind the times any more, but everyone to their own, I'm not telling you what to do just making a suggestion.