We would absolutely not be better off. Engine monopoly is harmful to security. When you have an exploit for the only engine, all users are at risk. If there was

We would absolutely not be better off. Engine monopoly is harmful to security. When you have an exploit for the only engine, all users are at risk. If there was even just 3 engines with comparable market share, that would increase the costs for attackers, and make it easier for people to switch if their current engine is compromised.