Uhhhhhhh....
U-turn only creates momentum, the chip is absolutely worthless, and Pheromosa needs life orb to even be considered viable.
Pheromosa's only niece lies with it being able to anti-lead hyper offense leads like Excadrill, and as hazard control on ho, which it can't do when it's banded.
It is overall outclassed by a number of mons with the main one being Deoxys-A.
Pheromosa is just too frail to take hits, and doesn't pack enough power to deal heavy damage.
First of all, look at your first statement. You completely missed the point. As you said, Pheromosa does not pack us much raw power as Deoxys-A. However, that is when U-turn comes in. You say the chip is absoulutely worthless and yet it the the reason why Pheromosa is able to clean up so easily late game.
And then your second statement comes in, are you saying that that is Pheromosa's only niche is that when I clearly stated it my second post? And if that is Pheromosa's only niche, then why would they place Pheromosa as high as B? There are many spinners available in Ubers yet most of them aren't ranked. That statement is honestly questionable. And Choice Band and Life orb sets do different things. Both annoy the enemy early game with U-Turn but given the freedom of Choice, life orb sets can be used to eliminate a certain pokemon in the enemy team that threaten the ally team, and also serves as a cleaner. Choice band is more of a mid-game wallbreaker.
I am not denying that Pheromosa is outclassed by Deoxys-A, yet they are walled by almost the same pokemon. Pheromosa is better in certain cases to break things Deoxys-A cannot break in one hit. For example we both know they cannot break Celestesteela.
252+ SpA Life Orb Deoxys-Attack Psycho Boost vs. 252 HP / 4 SpD Celesteela: 205-242 (51.5 - 60.8%) -- 94.5% chance to 2HKO after Leftovers recovery(I picked Psycho boost because it does the most damage)
252+ Atk Choice Band Pheromosa High Jump Kick vs. 252 HP / 252+ Def Celesteela: 256-303 (64.3 - 76.1%) -- guaranteed 2HKO after Leftovers recovery(the irony, but anyways)
This when U-Turn comes in(it's obvious that both die from hit). Deoxys-A is forced to switch out. So is Pheromosa, but it does chip damage in the process. This chip damage adds up later when it can eventually finish it off with high jump kick, as you can see from this calc.
The last statement does not make sense, but not in all cases. As you can see Pheromosa breaks certain pokemon better than Deoxys-A, and Deoxys-A from anything, so that argument can also go back to you.
Sorry if I sound rude, but I'm just wondering if you have ever seen a well-played choice band Pheromosa in action. It is surprisingly effective, I myself wouldn't say this if I didn't try it out. I was once like you, I thought Pheromosa should always use life orb. I decided to experiment, and it is quite effective.
Most of your statements have some truth to them, yet there are some loop holes. If my statements are not enough for it to rise, that's ok unless Pheromosa won't drop. It doesn't make sense. Your statements imply that you barely see any Pheromosa in Ubers, so I am not sure if you know what I am talking.