Tesla has limited capital to invest. They don’t have an F-Series profit-machine to prop all the other lines. 3 and Y take priority because they’re the most important for the mission. If Tesla has wanted to be a bit player, the could have stayed S and X only and been profitable and only worry about 1 platform. However, the goal was to push EV adoption, and you can’t do that selling $100k vehicles.
Obviously the next gen tech in the Roadster, S, and X will be out late next year, as Tesla starts selling $200-250k Roadsters and $150k Plaid S and Plaid X models, again, according to Musk. So, it will be hard to classify them as ancient, as they’ll be carrying the most advanced tech and performance available.