New form-factor.
New unlocking tech with sensors that have been reported (at least) to be difficult to produce reliably.
New screen tech (for Apple).
First iPhone without a home button.
It may or it may not be a first generation model. That is a matter of opinion.
But just because others do not share your opinion it most certainty does not make theirs rubbish as you stated.
Except it isn't a matter of opinion. Do you know what a first generation means?
iPhone 4 - a totally different design, a new display, a front facing camera etc etc. Was this a first generation iPhone? No.
iPhone 5 - another new design, a new display, a new port, LTE. Was this a first generation iPhone? No.
iPhone 5s - first iPhone to move to 64-bit, inclusion of a motion coprocessor and Touch ID. Was this a first generation iPhone? No.
iPhone 6/6 Plus - again, a totally revamped design, a new display, NFC. Was this a first generation iPhone? No.
iPhone 6s/6s Plus - a totally new way to interact with your iPhone (3D Touch). Was this a first generation iPhone? No.
iPhone 7/7 Plus - new dual cameras, removal of older features (headphone jack), quad-core SOC. Were these first generation iPhones? No.
iPhone 8/8 Plus - new design (in terms of materials), wireless charging, new display. Are these first generation iPhones? No.
iPhone X - new design, new display (not the first time Apple have used OLED), removal of older features (home button), Face ID, slightly improved camera compared to 8/8 Plus. Everything else the same as the 8/8 Plus. Is this a first generation iPhone? No.
Do ALL of the above products include first generation technology? Yes, they do. This doesn't make the product itself a first generation product. If every new feature meant the product itself was a first generation product, we would never have second generation products!
The iPhone X is the 18th iPhone to be introduced. It is not a first generation product. It is a refined and proven product that includes 1st generation technology.
Trying to claim the iPhone X is a first generation product to discourage the OP from purchasing the X is spouting rubbish. If you were to state price as being a reason or something else, then fine. But not being a first generation product!