You seem to have put more effort into making points instead of just attacking me, so here I'll go.
soooooo what is your argument here again then? Tempest is not gonna be an type of early game unit at all. It is gonna be a late midgame, lategame unit....
The fact that you seem to think people are going to just open straight into tempest without any other units just proves a lack of understanding when it comes to an RTS.
Yes, the Tempest is a late-game tier 3 6-supply unit that requires a Stargate and a Fleet Beacon. The Colossus is a late-game tier 3 6-supply unit that requires a Robotics Facility and a Robotics Bay. To put things into perspective, when reaching max supply (and ignoring mineral/gas expenses), each Colossus or Tempest produced is three fewer Stalkers, Zealots, or Sentries that can hold up the front line. Even in the endgame, putting the time and supply into both would likely spread the army supply rather thin, unless you only made one or two Tempests (more likely), or only made one or two Colossi (less likely).
One or two Tempests would certainly spark an opponent to act, but it doesn't seem like a very strong checkmate; so late into the game, Terrans can probably afford to spend a scan to snipe the Observer spotting for the harass, Zerg can make a detector for virtually free with a Viper, and Protoss obviously have Observers.
In a direct engagement, the Tempest doesn't sound particularly strong defensively compared to another Colossus, or another three Gateway units (though this is just guesswork based on its stats given to us), though the offensive side certainly would enjoy having initial fire both when advancing and retreating... In effect, I feel that the Tempest might have some use for breaking the late-game split-map stalemate, but who knows? Would just as much supply invested in Colossi/Archons/HT and a Mothership be just as effective? I mean, we
are replacing the nearly completely unused Carrier here, but still.
The other use I see for the Tempest is countering Brood Lords and Vipers, but that's kind of an expensive and slow path to build a counter.
Also you mentioned 1... 1 MU of 3. Banelings suck against Protoss, guess they are completely worthless unit and have no use in ANY mu.
iirc Banelings have seen use in ZvP, just not until late game with a bunch of ground units supporting the Overlords dropping them.
You really should just have actual experience playing a game competitively before you talk about it.
If my experience with competitive SC2 briefly laddering and playing with CSL players back at UofM and various Smash players in this thread is so outdated that it's now the
norm for Protoss to craft a death ball of Colossi supported by Carriers, or Zerg to strike with a mass of Ultralisks and Brood Lords at the same time, then I'll concede my points. However, as far as I've seen and played, people usually focus on one tier 3 before tech switching into the other.