I have a few issues with this thread... first it's supposed to be a list of changes, but it's only on the negative side, nothing positive - surely there must be positives that are gained from moving to this system (other than just cost).

Second, the list of issues noted in the OP are not specific enough to understand if they are a system limitation or an airline policy. It's possible that system limitations could be resolved with the changeover, it could also be an upgrade point. It's also possible that policies could be reviewed/changed.

I understand this is a list of "expected changes", so tough for any of us to know what the actual post-changeover system will look like without inside knowledge. Due to this, it's imperative to emphasize that most of the items are based on speculation and not fact. Or it may even be better to highlight this is current-state CO compared to current-state UA rather than to portray it as future state UA.