A:AnswerYou have it, mostly. What it offers is convenience, and rechargeable controller batteries. When you take off the headset, and put it and the controllers down on the dock, they charge without you needing to remember to plug in the charging cable, and turning the headset upside-down if you have the Elite Strip with Battery. It also means you don't need to keep a set of AA batteries nearby, to swap in when they run out mid-gaming session.
You get a set place where the headset lives while it isn't being used, and the knowledge that, if you put it back in its place when you are done, it will be ready for you when you pick it back up again. It is up to you to decide whether this is worth the asking price.
A:AnswerA fast charger is not included with the Meta Quest 3 charging dock. Meta does not include a fast charger because you are supposed to use the same charger that came with your Meta Quest 3.
However, the charger that was included with your Meta Quest 3 is not a "fast" charger, because it is only 18W. If you want the fastest charging for this charging dock, you will need to purchase a 45W charger