There is a serious problem with respect to non use of reservations it can result in being left behind particularly on Holyhead Dublin. But thats not the reason for this, its to stop people using Sail/Rail to bypass UK fares i.e. not travel on the ferry. That doesn't apply to IE issued tickets as you have to take the ferry to get to the UK in the first place
Irish Rail are actively looking at online sale of Sail/Rail but it could be some time
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