Quite true. I'm a genetics freak, and love my HRIR, so improving a breed with the genetics I love has been a fun project. And as someone pointed out earlier, we should all be having fun. ;-)
In RIR's, unless they are hatchery birds, the genetics are reasonably easy to figure out and generally consistent. Other breeds this is not always the case, so if you use genetics without knowing exactly what's in your birds IMO it is worse than useless. It is science alright, but not an exact science and this is why geneticists rarely agree on everything. I believe most of the disagreement is because they didn't know what was really in the birds when they did their research. If you have a breed that was made in several different ways in different geographic locations it is unlikely that genetics will get you a good bird.
Walt