So the solution is to make the station platforms smaller so the trains can get through. Now are they replacing the whole of the regional fleet with these trains? If not then there could be remaining train stock in use at the previous width. Would this not create a wider gap and potential for safety implications?
Someone said it is 10cm on each side, not a big gap but some users might have problems,disabled,mothers with pushchairs, cyclists with luggage on the bikes (or in my partners case a toddler in a child seat). Trust me a modest gap presents a bit of difficulty with a toddler on the back of a bike I've experienced that as our local station has a large gap if the train stops early due to the station's bend.
My point is by solving the current problem in the front of their mind they might create another one. Have they considered this or missed this like the train width limit in certain stations? Another service pack update (SP2) might be needed - using the M<S analogy.