All-tech and all-industry--should it remain in game?
Yes.
This strat can crash your economy even quicker and more thoroughly than #2 above.
No kidding. The economy side is what keeps these strategies balanced. They keep lowering and lowering the amount of money you make in each patch, why target such a difficult and expensive strategy?
It's an game mechanic exploit pure and simple
Sorry, I disagree. Its a focused strategy. With all factories (by far the easier of the two) you will really hurt with research for many many map combinations. The slower the research setting, in fact, the harder this strategy is. If you play on Very slow research on suicidal, you often will lose early because you haven't even whiffed planetary invasion when enemy transports start showing up. If it were an exploit, it would always work.
And this is my point: if I want to get the best balance of research and production on a planet, the best way to do that should be to build a balance of factories and labs, not go all-factories or all-labs and use the focus button
Point taken. I have good news for you. This is already the case. If you want BALANCED research and production (50/50), a mix of buildings IS the way to go. All factories limits you to only 25% research, that is an unbalanced 75/25 split. Likewise with all labs. If you like even amounts of both, these strategies are not for you.
my complaint isn't really with the fact that these strategies seem exploitative, it's the fact that there is no real efficiency penalty for doing so.
Again, I think it is just because you are ignoring the penalties. They are more expensive. They require you to plan what you are doing well in advance. Your empire is less flexible (for instance, if you are going all factories, there is no way to ramp up research, you are just stuck at whatever level you can manage - and its even worse for all labs). You need to be winning the game in a very different way with either of these.
I'm not upset or judging you or saying the all-xxx strategy is unfairly superior. I'm just making general statement that the game should play as expected. One would expect a mixed-structure setup would be superior.
A mixed structure setup is cheaper and more flexible. In many situations this is superior.
any dominant strategy will be come the standard
Maybe. It depends on how difficult the dominant strategy is. And how much more dominanat than easier approaches it is. If you get everything to work right, there is nothing more dominating than what you can do with an all labs approach. If you get everything to work right. I don't see this ever becoming the dominant approach, there are too many pitfalls.
As a slight aside, I'm glad that at least people have stopped saying that tech trading = auto win for the AI. Now we have moved onto this...
~ Wyndstar