Weirdly I played Heart (the follow up to Spire) at a convention recently and the GM, had a notebook full of stuff prepped for the four hour slot. The characters had a mission to do, and they were certain challenges on the Delve we needed to over come all were prepped.
The whole game seemed pretty my on railroads... in fact it was literally as we were following the magic abandoned underground system which was part of the game.
Unless Heart is vastly different in prep regards to Spire, (they guy was using Spire supplements, with his Heart game so I doubt it).
Then I don't think system matters as much as you think it does, it is much more down to the GM's style.
I'd say what you're giving expression to is a pair of things:
1) Convention gaming is its own thing removed from actual live play at a table (or virtually). Its more the experiential quality and camaraderie of convention play where (a) players often/typically have absolutely no idea about the ruleset in question nor the meta of the particular game (and thereby can be little more than passive participants captured by the orbit of GM-directed story) and (b) GMs who may not have mastery of system.
(a) is enough to kill a player + system directed game stone dead...and if it isn't, well a GM who is constrained by time and their own inexperience, while being commissioned to deliver some kind of interesting play, is the coup de grace.
2) Someone tells you they played a game of soccer and then goes on to describe a game that did indeed involve a soccer-style pitch, and offsides, and fouls...except described a basketball hoop to defend rather than an 8 x 24 horizontal goal and had a few designated areas of play where you had to use your hands to pass the ball to each other rather than feet...and someone named Calvin who was allowed to, on a whim when scoring was lagging, put boxing gloves on everyone at their discretion and tell two people FIGHT OK WINNER SCORES A GOAL FOR THEIR TEAM!
You aren't going to go..."cool. Soccer."
You go to a steak joint and order a medium rare ribeye and they bring you out a pizza, you aren't going to look at your meal and go..."cool. steak."
TTRPGs and American Healthcare are about the only things in the world where the provider can give us something entirely decoupled from any normative expectations or what was written on the tin and we can shrug and go "yeah...20 minute drive...1.25 hour wait, 12 minute consult with the PA rather than the DR, they didn't order my MRI, oh that is my fault is it(?!), reschedule for 6 weeks out after I waited 6 weeks for this specialist appointment already, $185 bill...
Healthcare!"