So you aren't happy there isn't enough of the old life expired stock to run a service, but you aren't happy we're getting new stock either?
There is enough existing stock, there is a problem with availability.
New trains are great when they work. You have a team at Abellio, the ROSCO and one of the suppliers who have little experience in commissioning a new fleet in the UK, or at all. Added to which you have a supplier who’s made a hash of a similar fleet elsewhere. Add to this the general lack of experienced engineering bodies to support commissioning of the umpteen new fleets across the country and you have good reason to fear things getting worse before they get better. Look at IEP, Mk5, 385....this list of painful introductions is lengthy.
Then add the whole fiasco around platform lengths and depot provisioning. That is incompetent, brought in part by lack of experience. Abellio have not had their finest hour with GA.
Above all of that you have the perilous state of the franchise with significant financial support being required from the parent.