To amplify a bit, if the platform starting signals were to become 'section signals', each lever would need to be fitted with an electric lock so it couldn't be cleared until 'Line Clear' was given by Deganwy on the block instrument. Any move into even the three sidings close to the platforms would need permission from Deganwy as 'shunting forward into next section'.You could abolish it, but then the platform starting signals would act as section signals - meaning less flexibility and some expensive design work and changes to the interlocking for a very small cost saving!
Retaining signal LO9 as the single 'Section Signal' keeps life simple, has no capital expenditure associated with its retention, and no increased costs associated with maintaining several electric locks rather than one.
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