The big problem I see is if you cherry pick your team you open the door for favoritism and politics. So, for years now people rightly are critical of USAG for corruption, abuse, trying to win at all costs, only focusing on winning at the expense of the mental health of athletes. So, the selection committee went with AA results, which is a fair approach. Now people are upset that the process was not more political and strategic. So, we want USAG to be fair and unbiased except for when we don't.
The push for a more strategic approach will open the door for the there to be more cases of athletes being left off teams for 'subjective/political' reasons as they have been for every Olympic cycle if you get a more political person to take Tom's role.
With regards to Riley, Marta probably never (or very rarely) took an athlete on a team that was injured enough that they could only compete one event at a trials and/or nationals. She took specialists but those specialists could compete other events if needed. Riley's other 3 events are completely unseen in 2021 competition, unfortunately. There have been cases where athletes used nationals scores to qualify for trials in past years.
I think also that the historic vision of the selection committee was to use trials and (some years) nationals scores to rank the gymnasts. However, if the selection committee feels justified, they can overrule the ranking. It seems this year they chose not to overrule the rank order.