I can't say for sure, but there were many people who posted, while SE4 was still in the beginning phases and into the beta, that they *never* bought SE3 because the demo didn't have a turn limit. How do you think MM would respond?
If they'd put a tech limit, or a map limit instead of a turn limit someone would have been upset. I remember many complaints about the SE3 demo because of the tech limit. I guess it's a case of you can't please everybody all the time.
Rambie