Expansion joints advice - Tile Advice

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Hi guys, in the middle of re tiling a bathroom. Very new to me...
I just come by a guide that recommended using expansion joints on the walls. Never heard of this before, from what i gather its just a fancy word for silconing at junctions on internal walls which i was going to do anyway. Silcone around bath and internal cornors. But is it a good idea to to install them in places on the walls in replace of grout or is this not a good idea

Much appreciated

 

[SJPurdy]

Only required if large walls over 6m long. In which case the walls should be broken up into 3 - 4.5m sections separated by movement joints. Most bathrooms are not this size and so then only silicone to the bath, shower tray and internal corners as you suggest.

 

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Ah perfect, yea room is much smaller than this, thanks alot bud