It could simply be that it reduces the length of the train, or allows more seats per train?
B&M don't care because they're four across, so can give each ride a larger seating envelope. Mack produce rides so efficient, it's also fine.
Some picture comparisons...
B&M seats are really deep and quite laid back:
Compared to the Intamin and Gerstlauer ones with lapbars that have thrown people:
You can see that they have a much more "sit upright" position than the B&M ones. Even Skyrush still has this posture enforcing position:
Which seems weird as Skyrush is four across so Intamin should have had more room.
It's apparent how much more room there is in the laid back seat coasters when you look at people riding them (and Skyrush certainly does have more leg room - it's an exception :lol: )
B&M - while people may have their legs bent at the knee, they CAN swing their legs forward:
Mack too, you can see the room (just about) the rides have. Front seat doesn't give much more room than the others - but people are clearly comfortable:
Yet Intamin?
Looks like maybe he's just sitting awkwardly, but I know from experience, that's how you end up because your feet hit the seat in front. This image shows it clearly (you can see how close the lad's knees are to the seat in front):
To be fair, NTG looks like it has a bit more leg room, can anyone confirm?
Not sure what the point is, other than I think at some point, there's been a compromise between fitting in seats and restraint/seat design which hasn't worked out well for certain people.
I think it's unfair to compare the B&M clamshells though as the rides don't offer the same levels of forces you get from the Inamin rides and NTG. However, for me, the Mack design is in essence the same as B&Ms (a slight evolution) and it holds people in through inversions perfectly well and comfortably.
I'm sure it's all down to the lack of reclined seating at the base of this issue with the rides ejecting riders of a certain body type.