It may be the best feature to you, but the dock is just a glorified charger for me as my rationale is if I can play it handheld, why would I play it differently. If it came out as a handheld only, I doubt my perception of it would change at all really. Best feature is actually split joycons controller as man it's so nice to be able to be any weird position I want and play a game comfortably.
A lot of the pros people list for the switch are all great, but I felt the same years ago about my vita, and I absolutely loved and still love my vita. I'm not entirely sure why people take it being compared to vita as an insult to the system, but I'm stoked for it seeming like a successor, and while there isn't a lot for me on the console at the moment, I'm very optimistic about the next year.