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Just wanted to know when you need to do this?What conditions?

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You dont need to if it doesnt give you any problems.
some with big cams do it for the ease of tuning... if
its a street/strip car I like to run advance... I have
a locked out one in my Rampage just for the dyno..
now that I know where it likes max timing I can curve
my advance one.... but its never required

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Just wanted to know when you need to do this?What conditions?

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The answer is; Whenever the motor wants it....

Like mentioned, typically the bigger the cam and the lower the compression the more timing the motor will want....

The way to figure it out is to set the idle rpm at whatever it wants to idle good at, then add two degrees timing....if the idle rpm goes up up, your motor wants that extra timing...now lower the rpm back to where it was when you started....keep adding two degrees timing and resetting idle rpm until you don't see any good gains....then run it long enough to get fully warmed up, shut it off and see if it cranks and starts good...if so, that's what it wants for initial timing....if it does crank hard, back the timing up two degrees at a time until it starts good and that's what it wants for initial timing...

Some motors want 10* at idle, some want 30-35*....you just have to figure it out...

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A loose enough converter that you would be launching at a point where the advance is all in anyway would be one.....same for a stick shift car. Advance helps starting and stop and go driveablity , so any time you can take either condition out of the equation I guess.
I have done both not providing power to the ignition until the motor was spinning and a multi stage retard box for starting and both took care of the starting issue.

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All my conv's are 5000 plus and I run advance on
two of those engines... just have it come in at about
1200 - 1500 rpms and be full at 1800.. easier on the
start up and killing the engine

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When your mechanic doesn't understand what it does, otherwise not.

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I wouldn't lock a distributor out do to the hot starting problems I've seen with locked out distributors With the ignition boxes out there now you can get one that will help you run a lockedout distributor but why do that when you can set your distributor up to work good I do have a crank trigger set up with a cam driven distributor head, no advance in either of them so I wlll either buy another pickup and mount it on the crank trigger to have it set to start and then switch it to the run pickup or buy a box with a built in start retard feature