Quote Originally Posted by Dr_Dinosaur View Post
If I take both Techsmith and Iron Chef as a Blacksmith, can I use Technical Maintenance ("[you] can perform the following maintenance") or do I just lose Craft Magic Arms and Armor for no gain because I traded the base Maintenance feature away?
You've just traded away CMAA for no gain. It adds options to Maintenance, but if you can't use Maintenance you can't use those options.