One may consider that e.g. for Android tablets, designers are looking at housing a generally generic PC that can run the OS, so most R&D is in ergonomics, size and power reduction; they can easily contract subsystems for bluetooth, wifi, USB etc.,. already used by other makers that in economies of scale, can make them affordable to include. But in T&M, a good fraction of a design budget is in fundamental measuring capabilities, say as a DSO, plus regulatory approvals are far more taxing to pass if not more numerous. Add to it, the T&M market is smaller, the device service life longer, and the actual experienced device designers for that type of gear, much less numerous.