As far as Zachtronics games go, you've been able to save multiple solutions since IIRC Infinifactory, and those games all have two or three optimisation goals.
I think Silicon Zeroes only remembers one solution per puzzle, however in most of its levels its goals are quite closely related.
OCTOPTICOM also only saves one solution per level, but only has one optimisation goal, I believe.
I don't believe your assertion is true; at the least, it is not true in my experience.
Okay Zachtronics games look awesome. I'll definitely have to try them out.
On the other hand, my experience with games "like this" are mostly free mobile games or other little browser games. For a paid game I would totally expect to be able to save multiple solutions.
As far as Zachtronics games go, you've been able to save multiple solutions since IIRC Infinifactory, and those games all have two or three optimisation goals.
I think Silicon Zeroes only remembers one solution per puzzle, however in most of its levels its goals are quite closely related.
OCTOPTICOM also only saves one solution per level, but only has one optimisation goal, I believe.
I don't believe your assertion is true; at the least, it is not true in my experience.