I don't think explosion swabbing detectors are operating in a free market: they are built off funds from government contracts. There isn't much reason to expect a similar pace of innovation as for email servers.
Why not? Money is money, after all. The contracts don't say how to do it, they say what to do. There's plenty of room for competition in these types of things, from how to meet the Performance Work Statement all the way to how to setup the internal org. structure to most efficiently handle contract compliance overhead.
