Yes, boot weight matters—but how much depends on how you ride. Most snowboard boots fall between 900 and 1100 grams per boot (in a size 9). Freestyle-oriented boots tend to be on the lighter side since park riders are spinning, hiking rails, and doing laps all day—every ounce counts when you're rotating or climbing. Freeride and splitboard boots with walk modes often run heavier due to stiffer construction and added features.
That said, lighter isn't automatically better. Heavier boots usually offer more dampening, which smooths out chatter and impacts at speed or in rough snow. If you charge hard or ride big mountain lines, that extra weight can actually feel more stable and confident.
The biggest mistake is chasing a low number at the expense of fit. A lighter boot that doesn't fit your foot properly will ruin your day way faster than a slightly heavier one that locks in comfortably. Also, remember to compare weights in the same size—larger boots naturally weigh more, so a straight gram comparison across sizes is misleading.