You may be conflating tools with gadgets. The latter are solutions to a problem that may not exist, or one invented to provide the solution with an application. Cameras have a sliding scale of gadget-itis, some being more useful than others. I'd define a photographic gadget as something that takes as long or longer to complete a task than an existing method. Metering is especially prone to gadget-itis, but focus is going down a similar route. DSLRs are gadget heaven, or hell depending on your perspective.
Originally Posted by markbarendt
Someone recently suggested to me, in all seriousness, that cameras should have focus bracketing.