The main reason for my annoyance on this occasion was that for about 20 minutes the train status was 'Preparing', so barring very last minute changes it was known which platform it was on, yet the board and the information clerk gave the impression of not wanting us to know.
Something about the layout at Paddington is very claustrophobic, around the display boards and on the concourse generally. I don't find this at Kings Cross or Euston.
Agree with bb21 that it's ludicrous to expect a few hundred passengers, who know they only have minutes to find their carriage and seats, to file calmly through the barriers - human nature isn't like that. I don't know whether Slough, Reading and Oxford are barriered, but if so there's an hour (less 'other duties' time) for a ticket check, which although would be a rush, could be a walk through "tickets please" glance to ensure everyone has one, rather than a close inspection.
(I know this is a silly idea as people would soon get the message that you only have to wave any old ticket at the guard.) Perhaps a RPI could be diagrammed to start from one end of the train while the guard starts from the other. The RPI could return to London from Oxford when passenger loadings have thinned out.
I know

absolutely nothing about this, so feel free to laugh, but I do think something needs to be done before some old dear gets mown down and trampled in the chaos.
It was bad enough at 1922, goodness knows what the 1722 and 1822 were like.