I have never said that there are not short forms out there, have I?
But whether you like the meanings of plain old English words or not (apparently not), occasional, random short-forming – the thing that is actually happening on GWR, affecting different services on different days and at different times - is not routine, regular, frequent, planned, deliberate, systematic or any other word you or anyone else cares to pick.
On Monday, presumably one of the days you are referring to, GWR rolling stock was all over the place at the start of the day after the major disruption caused by the overhead wire fault in West London on Sunday, but don't let that get in the way of having a rant, will you?
And at least a train of some sort is operating in those cases on GWR - I don't recommend trying to catch a train in some parts of Wales at the moment - see
https://www.journeycheck.com/tfwrail/ - rather a lot of let-down passengers there.
Oh deary me, what do we find when we look at the saintly Virgin's Journeycheck page right now
A five vice 10 Class 221 formation was also in use on some Chester route services earlier in the day. I expect most of the passengers to and from Chester and the North Wales Coast were perfectly happy to use what was provided, rather than have to wait another hour for the next service.