The MM 201, 121, MK2d, and Cravens have wider spaced buffers. The 141 - 181 and 071 locos have narrower width buffer spacings. I can see the reasoning in the IRM choice of buffer width when you take into account that modellers would have bought Dapol wagons in flying snail and CIE logos and repainted Bachmann wagons. A lot of people have bought and converted Parkside Dundas kits to resemble CIE wagons and not bothered widening the buffer spacing. I am sure that some have widened them but would be a very small percentage of Irish modellers.
I worked on a job once where we were installing an air conditioning along with air extraction system in other areas in a welding and metal fabrication company. Some of the curtains outside the welding booth's had to be removed to allow us access. Anyway one chap working in the fabrication section complained that every time he turned around to look over at the work we and the welders were doing he claimed the arc flash from the welding was annoying and affecting him in doing his job. The union got involved with management and tools were downed for 2 days. The way an agreement was reached on both sides was he was told to stop looking over. That is something that we have to do in this hobby, we have to adjust to certain aspects and returning models for a refund or not buying them in the first place are other choices that are available to us all.