Like just about everyone else I was briefly confused by this. I glanced at the research just enough to figure out how to start building it and just assumed it was taking forever. It was not until I went back to see what the other research upgrades were in the titan construction line that I noticed I needed more stages to finish it.
That being said, yes we will all know better eventually, but I would not be opposed to a simple message/alert being added to remind new (and forgetful) players that their titan has hit a wall in construction. It is an unusual new mechanic for builds to stop like that, and since other players are notified when we begin construction anyway I see nothing wrong with a simple alert to let us know our own titan has halted production and requires more research to continue building.
