Interior Of House Gas Shut Off Valves Question

["Robert11" <rgsrose@xxxxxxxxx>]

Have just learned that a house recently moved into apparently has
no gas shut off valves located inside the house for the
gas dryer, or the gas kitchen stove.

There is one for the furnace and hot water heater.

Plumber says it would be a really good idea to install one for the stove and
dryer, and, of course,
it would be.

But was wondering how  "necessary" this is.  The expense of a few hundred
dollars
is a bit of a concern.

Is this a "must-do" kind of thing ?

Are many houses in this situation, where the mains shut off valve outside
the house is the
one that would have to be used in an emergency, or whatever ?

Also,

This is the first time with a house with gas for the dryer and stove.
Was a bit surprised to see that these appliances are plumbed in pretty
rigidly
to the gas pipe.  Would have thought a flexible hose would have been used
for the last few feet or so
to allow some positioning or movement of the appliance.   But, I guess not.

Anyone care to explain this a bit ?

Thanks.