Thats all very well saying that, but as has been said and as you will know, most services dont have the cycle area and luggage racks clearly signed on the outside of the unit in order for the pax to make an informed decision as to which door they should be at.
Or, as some times happens with TPE, Ive had the occasional reservation for, lets say Coach E. Right then, trains approaching, Coach C... hmmm... Coach B, Coach A... must be the rear unit. No. Thats Coach A as well... hmmm. Okay, I'll pick this door and just stand for my journey.
For "the ordinary folk" it must be even worse, especially with cycles and large luggage. Which door to use? A train is usually just a train. Where trains do not run in a fixed direction each time, it would help if the outside of the train had easily identifiable colour coding - cycles here, luggage here, wheelchairs here... you know, like BR used to do with First Class accomodation and the yellow bar below the cantrail.