Jamie2k9: Platform lengths. Maybe you are right in some cases, but for example take Clara: plenty of room to extend on the Dublin end, and Clara is an important obstacle to full operation of 8-car trains on Dublin-Athlone. Sure it costs, but I would hope very little.
Laois depot: up to now you could have all shed roads filled to capacity with 6 cars having maintenance done. With so many 4-car sets, you can't: they take up 4 out of the 6 coach lengths available, leaving 2 vacant, which represents idle capacity, which can't be used are there are no 2-car sets.
Leaving just a few 6-car sets means a small number of such sets which further complicates rostering.
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