I get that. I have players like this as well. I actually put it to the players fairly recently, asking how much freedom they wanted. Did they want me to sort of hold up signs saying, "Adventure thisaways" or did they want to hunt on their own? And their response was mostly they wanted me to have a fairly obvious path for them to follow.
For example, I'm running Out of the Abyss. The party has arrived in the duegar city of Gracklestagh. I was perfectly fine if they wanted to stay in the city and try to carve out something of a niche for themselves there. And, I kinda hinted that this was an option. The players weren't particularly interested though. They want to follow the main thrust of the campaign - escaping the Underdark. Which is perfectly fine with me, either way.
So, perhaps "trail of breadcrumbs" rather than railroad might be a more apt description. Within the context of each area, they have a great deal of freedom. But, overall? Yeah, it's a fairly linear campaign with the party traveling from area A to B to C to ... Z where they escape the Underdark and then the second half of the campaign begins.
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As a DM, where I can get frustrated is with players who line up like baby birds, beaks open waiting for me to wheel up the plot wagon and shovel in the plot so they can gobble it down. Drives me bonkers. And it's not rare. My last group, or rather, the one I walked away from a few years back - had three players out of 4 that just refused to be any kind of proactive. They effectively wanted me to open up the Monster Manual at the Letter A, and say, "Aarocockra, fight". It was such an incredibly frustrating experience for me. I'm dropping hooks, trying to bring in lore about the setting, constantly dangling ideas and getting absolutely nothing back. I actually went out and created THREE treasure maps for them (it was a piratey, naval campaign using Ghosts of Saltmarsh as a base) and they took the maps, looked at them, shrugged and never mentioned them again.
I can see why some DM's start getting really railroady. If you've had groups like this. Where the players just expect the DM to constantly drive the campaign while you passively consume whatever it is the DM is providing, the DM's get trained to lockstep the action of the game. After all, in a group like that, if you don't force the action, then you wind up sitting around staring at each other for four hours and no one wants that.
It's a bit of a circle I think. Players get trained by DM's who are very controlling of the game. Or, conversely, DM's get trained by players who will contribute nothing to game. Players who can be replaced by dice bots and no one will notice. And around and around it goes. Then these players and DM's run into games where they're expected to be the driving force in the game or are supposed to allow the players the freedom to be the driving force, and everything turns into a train wreck - to mangle the metaphor.