I totally agree – and with your points about knees in aisles.
They are obviously completely mad (or input your own descriptive word). Especially as people are getting larger – not smaller is just utter stupidity. Like the plane debate around what type of aircraft you get – I do my utmost where possible to avoid trains that have 3+2. The middle seats of the 3 is so rarely taken – and when it is taken it is utterly horrible. And it reduces space for standing – which ironically enable more people to get on a train (I stand instead of taking a middle of the 3). I’d hazard a guess that trains with 3+2 actually have fewer people sitting on average – and also reduces the total number of people you can fit in a carriage. I hope my rant passes the rant test for this thread!