I am almost certain HD rumble is not really employed in Breath of the Wild, partially because it was also a Wii U title. You would probably be better off playing Fast RMX or Mario Kart to notice the rumble.
I don't know how that is a negative though, the Switch rumble is at minimum as good as former systems (and better in instances where the HD rumble is fully employed).
But that's cool you're liking it okay. I personally was very impressed with the build quality, sleekness, and comfort of the Switch in the hands. The 3DS felt kind of cheap to me and was extremely awkward for me to comfortable play with its weird joystick and small button layout (for someone with biggish hands). The Switch feels mega comfortable, I was uncertain at first about the two sides of the controls/joycons being so wide apart in handheld mode but it actually is very comfortable. and thank the gods::: BIGGER SCREEN. the 3DS dual screen just felt unecessary to me and the top screen was way too small, even on the XL