Are the signals as used on the square still taught? If so that may be the reason. What do aircraft without radio do? Ah , used the mobile phone and text the tower - I wonder if that has ever happened?
Aircraft with a failed main radio use the stand-by radio....
if you look a the 1940s shot of MH the 04 on the cupola on the roof is a runway number and this is where they were shown. That 29 would have been put up there.
signal squares would contain lots of info. Land on grass/land on tarmac/ which direction/ dont land/and other warning signs.
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