The T-9 shouldn't be anything but the T-9. There were no promises that it would be the pinnacle. That's just an assumption people make in the absence of a T-10, or something else. That assertion, that the T-9 should be the best trade ship, is not supported by the facts. It's just a T-9 Heavy, nothing more should be inferred.
And that pretty much sums it up, it has never been suggested that the T9 was supposed to be the pinnacle of trading, it is and has always been the space equivalent of a beat up old Kenworth truck with low maintenance costs. Op seems to be confusing the Panther Clipper with the T9.
Going back to maintenance costs, this has been discussed in depth a number of times in the past, the devs caved in and screwed up the balance with maintenance and fuel costs. Running a ship like the Python/Clipper/Anaconda was extremely expensive, the Lakon series had very low operating costs. Speak to any Clipper pilot back in the early days, even a heavy landing was a serious tax on your trade run profits.
Hopefully we will see a T10 along with the Panther and other various freighters, the T9 is what it is, and does the job well when in the right hands.
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@ racer1
Yes I know that the small cargo increase means a bonus on super short trade routes. However, that means for the player that he is restricted to this single very very tiny fraction of gameplay.
What are you on about mate?

There is a massive amount of short haul routes to choose from, I could even give you high paid routes that are between two or more ports on the same planet, no need for Supercruise.