Hey new grower I didn't post my last grow bec...

Light light light. Honestly need atleast 200w for a 2x2 400w for a 2x4 800w for a 4x4 and you can definitely have more light than that. Get a light meter make sure you give them the right amounts at the right times. Genetics aswell is a big part of density.

Genetics is the potential. If you gave 35ish DLI and loosely controlled teh environment within reason, then you can blame genetics. If your plant had all sorts of health issues or unsure about how much light you gave etc.. then you have to look at your own choices as a potential cause too. Time will tell.

Its mostly down to genetics and some environmentals. Eg light density and CO2 levels. But mostly its all down to genetics. Not all seeds/strains are winners, most are average, some below, and the rare bits are really above it all, its why some of the best stuff is clone only as its not always the same in seeds. Seeds are sisters and brothers, and look at family's not all brother and sister looks the same or achieve the same results in life. Same as seeds.

The Temperature with which you grow through flowering can alter the density of buds.

It's fitting to use the term "shed some light" because it was most likely not enough light that contributed to the lack of density. Without a diary to reference it's hard to pinpoint the exact cause but I would list the factors in order of likelihood: 1. Low light 2. High humidity in flower 3. High temps in flower 4. Genetics