I was gladly submitting with my T-6 earlier, as standard NPC pirates up to Diamondback Explorer could be beaten (slowly but surely) by constant turrets fire. They simply can't fire well when under fire. And bigger ones were easy to escape.
But, interceptors now fly in wings, no matter it's "just" Eagles/Vipers most of the time. I lose my shield pretty fast to one of them while suppressing the other - and my engines are gone in next few seconds. And no running from Vipers in any transport. But look, missions changed too. I don't trade any more. It simply can't bring more than missions, speaking about both fun and credits.
Remote systems now offer trade missions with more than 500k reward, like smuggle 2-3 tons of some illicit cargo few systems away. Few days ago I earned over a million on just one mission for smuggling mere 9 tons of Slaves. It'd take me 10 times more efforts if I hauled Gold with my T-6 instead. Now armored Cobra with just 12 cargo space (costs 4 mill to equip it) is best trader I use. I make 3-5 mill per afternoon of playing to relax.
Just be careful who you smuggle for, in order to keep your reputation with allies.