Yes, I contend that Pirate battlestation bounties *are* the intermediate tier. Anecdotal, but 50k bounties are still relatively common in my game, despite them being too trivial to bother with. I dont know what triggers this supposed disappearance, but it doesnt have anything to do with fleet size/power.
In 0.8, it was character level. I think it is time in 0.9, and if so, happens too quickly. If is still level scaling, they scale too fast, though not as badly as later 0.8.
Progression in early 0.8 and before used to be good until scaling of some form was added, then it went all out-of-whack since then.
Also, battlestations being the immediate tier is not obvious. If I had to guess, I would expect them to be endgame threats. Only after a tried a few that some of them turned out to be paper tigers, though some were much better armed or guarded, and were genuinely dangerous.
Battlestation fights can have high variance in difficulty. Sometimes, they are stupidly easy. Other times, they are a meatgrinder if you are unprepared. The easier ones are significiantly easier than the spiked-up bounties, and much more rewarding in money and rep than a named bounty of similar difficulty.
It's my opinion that players should have to specialize in this way, and not be equally good at doing everything in the game. Tough decisions are good. I have zero problems with needing a specialized character with a specialized fleet to do the absolute toughest big payday bounty missions, just they like would have to do to make trade profitable.
Then easier bounties need to be much more common until player fights many like how things used to be in first 0.8 release and pre-0.8. Right now, they mostly disappear too quickly, replaced by much harder fight too quickly.
Bounties =/= combat. Theres still plenty of combat to be found doing salvage missions or system bounties, that require far less skill/fleet specialization.
Bounties are combat. Missions that do not involve combat are not called out as such. System bounties are viable in 0.9, unlike in 0.8. Even then, they can still be tricky because if your fleet is too big (say you keep your starter fleet and/or start with Hammerhead), you need to E-Burn against every last fleet (after they E-Burn first) except the huge armadas. Players who are not too savvy may not figure out how to catch elusive fleets easily enough. If they downsize their fleet, then they may not be strong enough, depending on ships and/or player skill.
Also, if combat does not have a bounty, then it should be avoided (during the time bounty spike is a problem).