Boarding was done before 0.8a. Before 0.6a, it was too easy to get free ships and money. From 0.6a to 0.7.2a, it was a frustrating slot machine that got one or two forum users banned after posting very angry posts to say the least. 0.8a discarded boarding in favor of recovering ships.
If you mean something like a (platform) mini-game to board ships, it would require Alex to effectively make another game, and require different gaming skills that some could cheese flawlessly while others would struggle. Plus, if the mini-game could be solved, it just adds tedium to the game if the player does not care and wants to auto-resolve or get on with the game now.