They are most certainly an option and great if they work for you, but that’s beside the point, there are lots of reasons people may not like those. More to he point is that industry has been waking up about single use cup awareness and now loves to sell you a reusable bottle. Butt regardless of what capitalism is trying there is no single one solution for every possible human need. Selling beverages in public spaces must fill some niches though if it remains lucrative.