Tech can be strategy. If you do it wisely, you are not spending overly much and hedging that eventually you will unlock something of use.
As for “tech being random game win buttons” so are AA Guns. For that matter, every time you enter into combat or defend against someone making combat you are entering into a gamble.
I can’t even count how many times I lost a game because I attacked in Caucasus when I had 99% odds to win and been slaughtered by the defenders in Revised. Does that mean all those games were bogus and I should have been handed the victory anyway, since the other guy “cheated” and relied on “luck” to win?
In other words, saying we can’t use tech because it introduces luck into the game is a strawman argument to start with. It’s all luck! Even low luck is luck. Even no luck is still luck (since you are lucky if your opponent makes a tactical error.) Even Chess has an element of luck to it. If you want to play without luck, go play a computer game against an artificial AI, something that doesn’t take dice into consideration.
That said, unlike previous incarnations of the game from Larry, this version at least has tech do something other than buff units. We finally have a version that sometimes buffs units, sometimes negates the buffs of units and abilities.
For instance:
Rockets, Heavy Bombers and SBRs are countered by Not Repairing Damage, Cap on total damage you can take in a turn, War Bonds, Improved Factories and Radar
Mechanized Infantry are countered by Paratroopers (just drop a guy behind the lines and stop the tanks from blitzing infantry up, or at least slow them down, hence they counter each other.)
Jet Fighters, Long Range Aircraft and Heavy Bombers counter Advanced Shipyards and Improved Factories
Etc. The list goes on.
In summation, I think the only reason people (in general, not anyone specifically) vote against technologies in games is because they have a pat move plan and they don’t want someone to discover a technology that would make them think of something new to do. In other words, they are relying 100% on luck to make sure their plan works this time like it did before.