Massive-scale, actually: full-spectrum.
There are no aspects of modern technology infrastructure that are off the table in these realms: all systems are targets. Planet-wide.
So, its not just that the NSA will be reprogramming firmware or putting key sniffers in your macbook or writing 0-day exploits. Its that they'll listen to everything, anywhere along the wire, as they see fit.
Now, assuredly there's people out there that support field operations that could study the individual device and then exploit it given X number of days. To go from there to assume that USG can undetectably compromise most, or even a large enough subset of devices, is paranoid. The scale of that problem is much larger.
USG focuses on backdooring crypto for this reason. Much easier to compromise a few algorithms than it is to backdoor every device.
Fact: NSA/et al. have a complete catalog of devices they can easily implant in any consumer/corporate/civil/military computing device. There is a veritable market within these spook agencies, as customers of each other, such that reaching for a phone-book sized volume of catalogs is where the implant selection process starts ..
There is also much evidence that our CPU's are designed for intrusion in the first place. This is the scarier scenario: it doesn't matter how secret you think you are, if you didn't make your own CPU, there's a back door.