An interesting topic and in my opinion all answers have validity.
I think that most (if not all) EBME departments have an appreciation of risk based maintenance and in effect have had to consider their deployment of manpower shewdly over a number of years.
Perhaps, like many professions, they may have all set out initially to cure all ills and carry out rigorous and complete testing of all devices which fall in to the realm of a technical services department.
Practically speaking, with the additional notches punched through their collective belts, these service providers have had to rationalise and prioritise their provision under the guidance of various standards and in particular risk management policies and guidelines and rightly so, perhaps.
There are exceptions though. What about the Physiotherapist who tested their TeNS unit by placing their hand across the conductive pads to verify functionality and progressively increased the amplitude until the they 'felt' the output but didn't realise that a faulty potentiometer could deliver maximum output gain immediatley and fell backwards under shock and hurt themselves to the extent of an enforced period of absence costing their Trust (and department services) in financial terms and themselves in personal terms a bewildering period away from their career.
Or perhaps a midwife, with a nominally noisy pocket doppler, the angst of an enquiry when they correctly found a foetal HR one day and the next a mother had to be told that she had to endure something which none of wish to discuss on the basis that perhaps natural causes had intervened, only to find that their equipment was 'out of compliance' because it was last technically checked quite some time ago.
Yes, clinically risk is correctly identified and yes these incidences may be rare, but they do occur.
We know what constraints there are and maybe some could be attributed to they way that budgents are devolved, managed or whatever but regardless of this, engineers still have the capability of improving the lot of others who lack the conception either through lack of training, skills, intuition or knowledge which they may posess.