The argument whether to ban non-competes should be rooted in the practical applications of the clause. Highly skilled, in-demand workers have the power and financial safety to negotiate a non-compete clause.
The question is when the power dynamic between employer and employee is heavily skewed yowards the employer, can they abuse this imbalance to force non-competes as a market equilibrium.
For example, for a person struggling financially, the slightly higher salary may be a short-term requirement, while the non-compete ruins their long-term prospects.