X-01 vs. APA and more. Consider matching/differences. (Fallout 2)

What a thought, but maybe never came to a final answer.

Power armor X-01 (Fallout 4) vs. Advanced power armor (Fallout 2)

Since the release of Fallout 4, many people immediately give the value of power armor X-01. Here it is, the legendary power armor of the Enclave. But is this true? Surface description on the boot screen only gives way to hope for it (for lovers of the classics, in which they grew up), but not the confirmation. Even taking into account the outward differences of the armor, where the front part of the helmet and design of the shoulders differs significantly from that which was in Fallout 2.
Besides, nowhere in the game did not feature mention about the Enclave and the fact that the X-01 is their brainchild. Only mention that the experts of the US army I designed this suit of power armor, which sort of was part of the after the great war (but a specific period from and to is not specified), and then after used in surviving combat units.

"Model of power armor X-01 was developed by the US army and was used in the remaining combat units after the great war. Its parameters beyond that of pre-war counterparts."
— Loading screen

However, the fact that it is quite pre-war instance, it will say X-01 Quantum of DLC Nuka-World.
More like the fact that this is the first best production model in the U.S. army, which further for its improvement engaged the Enclave (the former of course once the US government takes your best first). Where u got the Advanced power armor after.
Yes, Bethesda did not seem to give any detailed response about it.
UPD: also, as a rule, in the U.S. military experimental samples of a vehicle or a weapon marked by the letter X. this implies that X-01 - the tested model of the prototype, which has not yet been launched for further full-fledged hostilities. In the future, the Great War and did not give the opportunity for this USA, but but later, the Enclave can do that.

Midwest advanced power armor (Fallout Tactics) vs. Power armor of the Enclave (Fallout 3)

If you remember the comparison on the fact that power armor of the Enclave in Fallout 3 is the same (lapped, like, exactly exactly) that power armor from Tactics'a, there will be questions. Supposedly made similar to the old (lazy developers, however, had to think of new, etc.) and issued in a new style. Where is the Enclave already is... But not the point. Where is the confirmation?
Emerging issues: in connection with what the Enclave has mixed with the new Brotherhood of Steel?
Of course, relatively visually, they resemble each other, but in the future see more differences than similarities. On what basis one came from a completely different?

Power armor T-60. The story in Fallout 4

Based on your description of the power armor T-60:
"Power armor, T-60, the American army started to use shortly after the battle of anchorage. Even October 23, 2077, the day when America dropped nuclear bombs, the soldiers in the armor of the T-60 was standing on the streets and tried to restore order."
— Loading screen
UPD: this implies that this variant of the armor has only been used to suppress the demonstrations and aggression by rebels of the people, were registered to the police and was not intended to open hostilities.
It seemed possible to complete this question or look for more detailed notes (which in General is not).
Specifically, the full version of the creation of this power armor is not installed.
Probably the so-called West-Tech did this and floated this armor is closer to the beginning/end of a nuclear war. After the battle of anchorage. Of course, the beginning of which US citizens found out just as suddenly.
However, if you remember the Intro of Fallout 4 (YouTube Videos), it is unexpected to see that the soldiers in power armor, T-60 obviously prepared to battle for anchorage(?).
I propose to consider these questions and terminate disputes.