I concur.
Sativa: Tall and stretchy.
Indica: Fat and bushy.
Hybrid: Could be either, whichever characteristics it has shows its dominance.
Bagseed is almost always Sativa, because by nature, seeded stuff comes from outdoor growers. Sativa is a lower maintenance plant that needs less water, and it is more suited to being left alone outside. Indica is shorter, requires more water and nutrients and will give a higher yield typically. That's why indoor growers, who are pouring money and time into their plants, prefer Indica. They'll use techniques like cloning to ensure they don't get any males, and the final product is mighty Sinsemilla.