"if you have proven its effectiveness and usefulness."
Accurate zero position is the key for many jobs. It is especially important
if you have a job, that spreads over several days and you want to turn off
your machine for night and continue next day.
Mechanical switches are unreliable.
Proximity switch has hysteresis problem, larger diameter switches are less
accurate (usually)
The only real candidate that is relatively inexpensive is the encoder with
index if you want to do precise work especially true for rotating axis.
Of course all this depends what is your target application - "el cheapo"
home made oxy cutters or plywood routers do not matter, metal milling or
lathes need accurate positioning especially for repetitive work. Steppers
can also do quality work for most jobs if they are properly sized.
Y.
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