My lower back isn't entirely happy with the mesh seat on the trike, which is tensioned for the benefit of barakta's shoulders to the effect of very tight at the top and a bit looser in the middle. The effect is much like driving a car, where I usually get mildly annoyed by poor lumbar support after a couple of hours.
No lower[1] back problems with long rides on either of my recumbent bikes, which have the same hardshell seat (and Ventisit pad, though one is much more worn than the other) at different (but both more reclined than the trike) angles.
(FWIW Both barakta and I have quite deeply curved (anterior lordosis) lumbar spines. She gets hers from her mum.)
Make of that what you will. It's a bit harder to be scientific with mesh seats, but they're easier to tweak.
[1] The Red Baron's seat angle favours aerodynamics over comfort, which makes it harder work on the neck/shoulders (though less so, and in the opposite direction to, an upwrong).