Basketball manager and basketball coach are not the same thing. Going by your definitions, GM=daytrader and coach=basketball manager. In real life it does not work like that. I have played basketball in a national league in Europe, I have also taught kids for a couple of years before I busted my knee. Economy, roster composition, salary decisions are all things only a GM would manage, not a coach. Training, tactics, depth chart are things basketball managers do not decide, the coach does. They are different jobs. However in this game, as a GM, you also take over some of the coach responsibilities and that's where the confusion arises.
If you see this game as a "pure GM game" don't you agree that we shouldn't even be talking about tactics or training, which is the topic of the thread? The truth is you can't just classify this game with a clear cut real life terms, since it is just a game drawing elements from various aspects of basketball: the game, the coaching and the management, without being exactly any of them.
Now back to tactics please. The OP asked if we believe there are other viable tactics among the "balanced" range. Marin Said LI/LP are still overpowered and OD is overpowered (in stopping 3 pointers), so there might be some changes in the future which improve outside/balanced tactics. Since you alternate BO to LI/LP you surely have something to contribute to the discussion. At least if you think your team performs better in BO rather than PTB or II, which is something many would probably not agree with.