The partition doors are part of the fire safety mechanism, if the train manager selects the emergency mode the doors are meant to close and the air conditioning intake damper will close as to not suck smoke in or allow it to move through the train
As there are trains in mainland europe which are open end to end without inter coach doors the requirement to actually have the partition doors working may not be essential on the safety list
If you wanted to go through a very long tunnel probably a requirement, the train is specified for that
They are provided to keep the coach quiet and ensure the air conditioning works avoiding the blast of cold air when the external doors open. I think the key problem is the triggering of the doors combined with current accessibility rules
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