I'm concerned about lack of seats and particularly amazed by the lack of loos. There seems to be no consideration for people who may not be in the best of health and they definitely haven't travelled on the late trains.

These seem to be built to transport people in high numbers over short distances, not in comfort.
I understand some of the fast services from Maidenhead are also going so if the connections aren't perfect we'll be stuck for half an hour and then have to take a slow train. We haven't even got the compensation of it being Crossrail and taking us all the way into central London.
I'm really not feeling very optimistic about this.