The 230s are required to run the improved service on the Bidston - Wrexham line though and they are more suitable than 150s for the line. Unless you think the half hourly service will not happen then the 230s use on Chester-Crewe and Conwy Valley will be temporary. The situation has not be caused by the ToC but by WG refusing to prepare for the PRM-TSI deadline. 5 x 769s are on order and are all ready very likely to be delayed and there is no chance of new stock entering service in the next 18 months. There is no capacity left to upgrade Mark IIIs either, which leaves the 230s.
To act like the passengers experiencing them will, I couldn't give a stuff about the Bidston line. I care that I've travelled hundreds of miles and my first experience of Wales is changing from an intercity train to a london underground cast-off
It's "only til 2022". That's plenty of time to alienate a lot of people, both local and visitors.
It's OK though, they noticed there were slightly less obsolete carriages becoming available for their fantasy Junction to Cardiff commute. If it's such an important route, make it mk4s+loco all day. I wouldn't argue against that