Due to the way low sec and null sec rig material efficiency bonuses work, for years now, freighter production has been in the hands of a select few that have gotten stupidly rich. A select few.
You simply cannot build profitably in high sec and compete with them.
It was probably a feature designed to fuel pvp but who in his right mind takes a freighter full of minerals to low or null sec to start capital components production?
Point of the matter is, the freighter is a high sec ship, it shouldn’t get material efficiency bonuses from its components being built elsewhere.
This is just the tip of the iceberg, more here:
High Sec Manufacturing Dead