Devices do NOT replace eliminating standing water, stocking ponds
with larvae-eating fish (goldfish are voracious), pruning back
vegetation, and fixing door and window screens. The devices
offer limited local protection, and only if you use them EVERY
time.

Nobody said they were replacements for the obvious -- I would like to know
how effective some others have found them. IMHO, they are quite useful.
For example, devices like the Mosquito Deleto and the Mosquito Magnet are
very effective in some environments. Additionally, it is not always
possible to eliminate breeding grounds -- where I live, the city has several
thousand acres of land that is undeveloped and unused. It is covered with
woodland and has ample breeding spots for mosquitoes. There is no way to
get the city to send workers through this acreage and for the main part
cases spraying would be ineffective due to the density of the trees (as if
the tightwods would spend the $$$ in the first place).

It's called "window screens". I've heard they have worked well
since the 1800s.

Doors open and close. Pets (and people) bring mosquitoes in on their
hair/fur/skin without realizing it. Window screening is ineffective against
these scenarios and even the most anal of homeowners can and will miss small
areas of damage upon inspection.