I'm not sure if Frontier knows this, but these sourcing missions don't make you more than several passenger mission runs since you need to buy the commodities for the sourcing and even in a T9 (and I used a well protected T9 for hauling/smuggling in Open) or Cutter you were running back and forth 2 or 3+ times which means these weren't quick missions that paid as much as passenger missions despite the eye-popping amount of "50 million" (quite a bit less after you're out of pocket for the not-cheap commodities and taken 3+ trips to do it).
You seem fine with how much passenger missions pay, but when something else starts to approach them it's seen as "too much". Why do you seem to want players to focus on running passenger missions? Why don't players have a variety of activities that pays great when doing them at a high level?
The main reason I enjoyed the sourcing missions is that a bunch of them asked for various contrabands (narcotics, imp slaves, reg slaves), and I love smuggling and would like to focus on it over other careers. However, smuggling has paid horribly for a long time now, and the sourcing missions gave me a chance to actually play my favourite career and make some cash instead of ferrying passengers around if I needed to make money-- I feel you need to allow other careers to begin to achieve the same possible cash as passenger missions, it's really a strange balance going on since at least 2.4 if not longer (I started playing in 2015, and took time off and came back last November during 2.4).
I don't need to min/max, and I wanna do what is fun for me to do (smuggling and combat). Being a pragmatic person though, if I see one activity pay a few million an hour in an expensive ship versus 100 million an hour and the 100 million an hour thing is much easier/more reliable, I'll feel like a dope for not doing the thing that pays. Or I'll feel like I have to go do the thing that pays as a kind of homework before doing the stuff I find fun.
I've noticed more missions spawning on mission boards in general lately (at least in my experience); that is great! Frontier should be applauded for that since that's often come up as a complaint by players. And I've been noticing more frequent smuggling missions from various Anarchy factions, and even many smuggling missions with planetary bases as a destination, which are all things I've personally wanted for a while. But, they still pay much less than LEGAL cargo nearly every time, which doesn't make any sense, and all hauling/smuggling is way behind passenger missions even with the nicer paying sourcing missions that just got changed again.
Ya gotta bump up the pay combat pilots can make (it's so weird that it pays so much less than A to B risk-free passenger missions), and ya gotta improve the pay for smuggling missions. I also propose adding a bonus for smuggling missions with a planetary base as the destination-- you can't just boost through a mail slot to avoid a scan with those, it adds a nice challenge where you gotta not only dodge security but contend with the gravity of the planet, and you adjust your approach and strategy to account for these things, which results in the mission taking more time with a higher (fun) challenge.
It'd be a fun reward for a fun activity, and the security of the system, the gravity of the planet, and distance traveled should be accounted for somehow. Right now, they just pay so little, but I am happy to see more of the mission type spawn in more locations compared to 2.4 and 3.0.
I'm also happy to see mining missions pay more now, but the amounts required seem very erratic, with 30 tons of Osmium and a few hundred tons of Osmium (or similar) paying the same at the same station. Still, I hope dedicated miners can now make a decent amount for their work, since I always felt it was weird that it paid so little.
Combat, smuggling, and piracy are all fun activities in the game, and come with an inherent element of risk. If you make those pay nicely again, then I think less players will get bored from grinding passenger missions all day. I feel like risk/reward/FUN is the important balance here, and Frontier can achieve that much better than it has been.
(And as always, when you reinstate long range smuggling/couriering like you mentioned you were working on, please make all smuggling "fail on scan", and select couriering also "fail on scan". I think it's an important component to make the missions more fun and rewarding)