This is all nitpicky and arbitrary, which is largely my point. The line between misdemeanour and felony is thin, but the consequences of crossing it are severe. In one state, you might get a $50 fine; in the next, you might be barred from voting or lose your green card.
Besides, different states have different laws. This isn't arbitrary but how our country was designed to work.
I can understand why the question is asked though. The jury is there to find facts, i.e. define what has happened. The judge will then find the "correct" sentence if found guilty. The jury should not be swayed to a not guilty finding if they believe a guilty would be correct, just because the possible maximum sentence is too long, even if it would not be imposed in the case at hand anyway.
Just one of the hard realities of the legal system.
This is, exactly, how the immigration debate is being held in DC. One undocumented shot and killed a citizen by accident, and now we're supposed to kick all immigrants out. Visceral emotion is a great tool to optimize society for corner cases.