I think @Henk pointed out the real problem. In an effort to keep all points of the game "team-based", the current mining system is great for people who understand it (I've been playing C&C mode since 2003), but it's too convoluted.
Personally, I'm more of an offensive player, so if base defenses became more of an automatic process, I think that could allow more players to develop other strategies and tactics while remaining more simple for new players to pick up and start contributing to the team goal.