1. 3D fighters don't usually utilize the vertical axis anywhere near as much as a 2D fighter. You generally stay grounded except for small hops and when you're juggling dudes. So, still mostly 2D.
2. 3D fighters have walls, corners, and ring outs. I'm not aware of any 1-hit loss elements in 2d fighters that work like a ring out.
3. 2D and 3D in fighting games refers to the axes of movement available, not the rendering tech. Most 2D fighters made today are using polygons.

One last thing to know: if you're coming from another fighting game, throw out whatever you know and start over, mentally. VF is a very different game compared to literally everything else. Concepts learned from other games often become baggage that holds you down from accepting new knowledge and the old stuff you know wont be useful until you at least learn how VF works at a basic level.

For example, (imo) VF is literally the opposite of street fighter in every way. VF is not a game based primarily on footsies, like SF or Tekken (though VF does have footsies). Unlike other games, especially other 3D games, it is a very fast-paced, close-range based game where you manipulate and overwhelm your opponent by using constant frame traps and mix-ups. Being wrong means praying that you can get out of the next mix-up unscathed (if you can catch it). Getting a read on your opponent is pretty important in VF.

That being said, I'd say to new players, the best thing about VF is its sheer freedom. Unlike other games, none of the characters here can be shoved into an archetype box. For example, some people might call Wolf a "grappler" like Zangief, but that's simply not true. In fact, you can theoretically can take Wolf, primarily use him as a "striker-type" character, focused purely on mixups and frame traps, and literally win an entire tournament without ever using a throw (I wouldn't count on it, though). You could even use a "striker-type" character like Jacky or Sarah and play them in a "grappler style", if you want to (its a hilarious, if dangerous, way to throw somebody off). That's the beauty of VF, you can play the game however you want -- you are not shoved into a character archetype or playstyle, and can play completely differently from game-to-game, no matter what character you pick. Its not unusual to see two different people pick the same character and they play completely differently. VF characters are essentially just paintbrushes for your own style and personality to shine through. (y)(y)(y)

What's even MORE amazing, is that when you consider that Yu Suzuki and AM2 came up with such a beautiful, complete system back in the early 90s for VF1, most companies (yes, including Capcom) had absolutely no idea what they were doing when making a fighting game (since the genre was still brand new; but yeah, VF1 balance was pretty busted, though, lol). Yes, that Yu Suzuki guy is actually a genius.

4. 2D and 3D fighters have a wildly different feel gameplay-wise. I think you're trying to argue this for 2.5D shooters, but are somehow ignorant of the fact that 2.5D is just shitty 3D born entirely of hardware constraints.

5. How dare you compare shitty 2.5D rendering engines to my beautiful 2D fighting games top of head flies off
6. 2.5D as an aesthetic aged like milk. 2D games still look great, even to the point that shit tons of games are still made entirely with sprites.