Docker is still pretty new. If you were the owner of a horse and someone was trying to sell you one of those new fangled cars you would have a bunch of question

Docker is still pretty new. If you were the owner of a horse and someone was trying to sell you one of those new fangled cars you would have a bunch of questions about why exactly this car is better than your horse. And should you be going with the cheaper Ford? or one of the more expensive models? She's not writing a critique she's asking questions about tradeoffs from the viewpoint of someone who doesn't know the answers.