There are plenty of higher quality electric vehicles.
The acceleration is one tiny aspect of customer satisfaction.
Tesla has worst in class interiors and reliability. Not having buttons or trays is something only Tesla can get away with.
Is it better for the environment to buy a used car? Or better for the environment to buy a new car?
You need to realize that other people have different priorities than you do. Not everyone cares that their car be as luxury as possible. They just want a good electric vehicle, and there's nothing that beats the Model 3 at that price point -- not in range and not in performance. Yeah, maybe it doesn't have leather seats as nice as the BMW, but most people don't prioritize surface-level luxury above all else, and especially not hardware/car nerds.
Perhaps you should have a personal experience with them before going around just repeating what you read somewhere or from your imagination.