To my knowledge, no one suggested, certainly not me, that the Liaoning participate in the SAR exercises. And the aim of the group going would not be, as I have indicated, directed at the exercise. If that was all it was, then yes, it would be a waste of time and resource. But that is not the thinking.
Since US law puts massive curbs on what the US military can do in training with the PLA, apart from SAR and some similar low key sideline exercises, what else can you actually expect any PLAN ship to participate in at RIMPAC? Besides, it would be a bit impolite to show up with a fleet if the hosts only invited you to send one ship.
There will be plenty of other times and opportunities for goodwill visits. It would make little sense for the PLAN to choose to make their first goodwill visit at the same time as any other big event.
If the Liaoning's visit grabs all the attentions and headlines, it can be interpreted as a subtle insult to the event organisers and participants by stealing their thunder. If the Liaoning's arrival is overshadowed by the other event/exercise, then that's a bit of an own goal if the purpose of the trip was a PR flag waving exercise.
Actually she could train going to and from...with her escorts, and if ready, with some aircraft as well.
As I said before, there will be big safety concerns and constraints with many of the kinds of aircrew training central to achieving operational readiness if you take the ship outside of range of land based tankers and divert fields.
This would be an especially big concern if the pilots are new to carriers and have not have much experience with carrier ops before, as you would expect of the majority of the pilots a year from now, especially if they do not surprise us all with a big batch of J15s soon.
And again, the exercises themselves are not the reason for the group to be going, as I have indicated. The opportunity to make a very strong international and Pacific oriented statement of goodwill would be the principle purpose of such a trip...and the gains the PRC could realize could outweigh such other considerations. It is a matter of strategic thinking as opposed to tactical.
An 054A or 052B would serve that purpose just as well. Considering the consternation that the PLAN's modernisation in general and carrier program in particular is causing some of China's neighbours, too strong a showing could easily be misunderstood or misconstrued as a show of force and have counter productive results.
But ultimately, at the end of the day, the primary reason for having a military is for national defence. Everything else is a distance second to that primary objective, and it would simply be a mistake to sacrific the operational proficiency of your military for a PR exercise.
If taking part in RIMPAC would adversely affect the training and the date the Liaoning would achieve operational status in a noticeable way, then she should not go irrespective of any other considerations.
Flying the flag is meaningless if doing so makes the guy carrying the flag less able to fight for his flag and country.
Anyhow, as I said, I do not particularly expect it...but would like to see it.
Maybe one day she will participate, but it will not happen this time, I am sure of it.