Worst tech for me.
FutureTech
Aesthetics, too. How come they say it's better researching it than alphabet? The only good thing about it is when beelining Lit to get TGL.
AI avoids it, which means in tech trade games it is extremely valuable to research.
Otherwise, it's an average tech, nowhere near worst even with trades off...not when it has to compete with junk like future tech, robotics, and divine right.
In Civ 1 it was horeback riding In Civ 4 BTS for it's the advanced flight unless You really need those choppers (gunships) It's better to fight fire with fire tank vs tank with anti tanks covering the defenses besides I think it's the flaw of Civ 4 that flying units are far too easily contered by SAM, therefore I rarely rush towards fighters and usually have a decent fleet of Zeppelins just to spy on people
Unless you don't have uranium or something, all of the later-game techs except laser are a waste of time (usually laser too against the AI which really doesn't do well with first strike nuclear warfare tactics <3). None of that junk resists tactical nukes well.
However, if you're not just spamming "win" clouds all over the place, then jet fighters on carriers are actually really strong. They have tremendous range, unlike in cities can be stacked infinitely, and tear through enemy air power. They mesh well with gunships which can clean up after them (and they clear the sky of interceptions so that you can paradrop). None of that is practical though, because nukes and naval strike + raze exist.
Still, the fact that you can use it at all tends to push it ahead of future tech, divine right, and ESPECIALLY robotics which is arguably the consistently worst tech.
Robotics:
1. Is a trap for space (will almost always slow your time, 99% of cases or more)
2. Unlocks a military unit that is only marginally better against gunpowder than the unit that predates it and has no special ability in an era where virtually everything has a powerful specialized ability.
3. Carries the single most useless wonder in the game by far.
4. Is not required to accomplish any victory condition. In fact, it tends to be a hindrance even in very late domination because you have to forgo more useful techs.