They are not ALL incompetent, lazy or just useless, but a worrying number are.

"Lazy" is rather subjective and can mean "wont work for the inadequate sum that I am offering"

But a worrying number are incompetent.

Recent examples include

Inability to carry out simple and approximate electrical calculations by mental arithmetic.

A belief that "tri rated" wires have three times the current carrying capacity of other types.

Complete failure to understand diversity, and in particular believing that diversity means that a 20 amp circuit can supply a 30 amp load "due to diversity" or that a lighting circuit need only be sized for say 60% of the connected load "due to diversity" The only common example were this is correct is an electric cooker, which could be considered as a number of appliances assembled in one case.

Inability to understand two way light switching, and as for switching from MORE THAN two places, forget it.

Inability to locate faults in existing circuits.

Somebody previously had connected into a switched fused connection unit to supply a back room kitchen/utility room. The new wiring had not been fully completed there. Presumably some of the new unfinished wiring was to be powered up via the switched fused connection unit. The only problem was that the switched fused connection unit was for a removed storage heater and so was just "off peak" only, so no good for a 24 hour  supply, temporary or permanent.. Doh!

Z.

Somebody previously had connected into a switched fused connection unit to supply a back room kitchen/utility room. The new wiring had not been fully completed there. Presumably some of the new unfinished wiring was to be powered up via the switched fused connection unit. The only problem was that the switched fused connection unit was for a removed storage heater and so was just "off peak" only, so no good for a 24 hour  supply, temporary or permanent.. Doh!

Z.