The ability of players to reproduce any desired set of skills, ships, and modules at no risk and at no cost is probably the largest driving factor in player participation on SiSi. This sort of testing is vital to FCs, tournament participants, and many others, even if it’s not the official purpose of Singularity.
Without the “playground” aspect of SiSi, the number of people with an installed client will likely decline, and CCP will start to see difficulty in mass tests and in soliciting player feedback on new features. Unless it’s an eagerly awaited “jesus feature”, very few players actually care enough to come try out a feature on the test server. We’d much rather wait until things are live to pick it apart and flame the developers for the next 6 months to a year on the forums, Twitter, Tweetfleet Slack, and Reddit.
The official combat areas in 6-C, are simply a place to lose ships, that’s all. The fairness of those areas really does not matter whatsoever in the grand scheme of things. Remember, this is still EVE Online we’re talking about, a game in which the only things that even remotely resemble a fair fight happen during the alliance tournament. “Gudfites” are as rare as officer spawns in highsec, because the vast majority of players will only willingly take a fight if they feel absolutely certian it will be a slam dunk.
There is however nothing stopping you from using the combat areas in the other systems, where it’s less of a “capital blobs online” experience or from setting up consensual combat in another system of your choosing, under whatever rules you and your friends can agree to, perhaps one far removed from the designated combat areas.