To give you some figures, for a large moon start (Environmental Suits required):
Turn 1, TL 4 Soldier:
As I had just learned about Strucutural Design and that one had 87, I instantly did a new design line:
The Soldiers will be obsolted the second I no longer have any in my units.
Even if it is worse then the Soldier-at-Arms I, the Soldier I is still a unquestionable upgrade over what they would build otherwise.
And 3-ish turns later, they get access to Soldier-at-Arms anyway. Any soldier they build in hte meantime? Still better then building the equivalent Militia Model!
So what? How is that relevant to the OP?
Nicht kleckern, sondern klotzen!
*Please remember all posts are made by a malevolent, autocratic despot whose rule is marked by unjust severity and arbitrary behavior. Your experiences may vary.