Don't get me wrong, I'm not a "fan" of the rank grind, I'm just making the point that it makes the ships available with the rank grind more viable.
If you got "less" with the rank grind than you could without it, would you do it? I'm betting no. Hence, the rank grind being viable.
As far as Corvette/Cutter contrast/comparisons... all ships have cons/pros/tradeoffs. They're not all supposed to be equals in every role. (and this isn't really the thread to debate them all, either)
IMO, the entire ship progression system needs a good overhaul, period.
As I detailed in other threads, it shouldn't be all about getting the biggest ship- every ship needs a place in the game other than being a stepping stone to the "Big 3" (or 4, or 5, etc.)
As I said it throws a bone to lick and if you are a grinder it will give you a great ship.
For me both Cutter and Corvette are attractive because Corvette feel like a real Battleship and looks like one, Cutter looks amazingly slick.
But as I gamer I want to put X amount of effort and get back at least half of it as a return benefit. So the questions is with 5x times the effort to get either a Cutter or Corvette compared to getting a cutter and 20 times compared to Python , which of course is not their price but their rank grind, will give you a ship that is 2 to 3 times better than an Anaconda and 8 to 10 times better than a Python ? Not even close. What you get is a 10-20% overall added value compared to an Anaconda and 30-50% compare to a Python. So yes they offer more but not enough to justify the grind, not even remotely close.
On the matter of Corvette vs Cutter is up to debate combat wise, but as a Cutter fanboy if anyone asked me which of the two to pick for more aggresive gameplay/ combat, I would say the Corvette in an instant. Cutter is slow and tough but in the end being the less agile ship in the game makes it extremely boring combat ship. It reached it a point that I had my cutter not moving at all, all turets because why bother, alt + tab to internet browsing and come back 5 minutes later to fire my big shield cells rinse and repeat. So I stopped doing any form of combat with this ship apart from 2 million Assasination missions because I am a greedy boy.
So are the best players in the game. Your point? I prefer small ships too, they are a lot more fun, and this is a game. Face tanking everything is no fun at all.
Actually I even doubt you are a minority most gamers own more than one ship and its highly unlikely that they dont own several small ones. I recently got a diamondback explorer and even tried for combat. Definetly 100 times more fun than my Cutter.
Why limit yourself on one ship ? Variety makes the game a ton more fun.
This is review I have been waiting for. So trading in low sec/anarchies might be a thing with T-10 Defender.
Personally I think the only threat will be FSD interupt weapons
http://elite-dangerous.wikia.com/wiki/FSD_Interrupt
Kinda doubt a NPC will have those, but players probably will. Other than that, they cant stop a T10 jumping away a few seconds after interdiction. Just make sure you submit to not risk a full interdiction and not being able as a result to charge your FSD. It can get annoying though because NPCs will interdict you a lot if you stack missions or carry a lot of valuable stuff. Its no big time waster though so its ok.