A lot of people are unable to envision a problem that someone else might be experiencing. Take, for example, diminishing flexibility and agility. If the bike is lying on the ground and you straddle it, you must still be able to pick it up easily, and if the bike has a handlebar bag and/or rack pack or baskets with stuff in them it will be even more difficult. A bike that is vertical on its wheels is very well balanced and easy to keep stable, even with weight on it, but get it leaning and watch out.