The point is Alissa needs to demonstrate that she is back in competition shape well before SA. If she avoids the summer comps because she isn't ready, then it would be better for her to do Regionals rather than an international as her first event in 18 months. I don't think it's a waste of time for Alissa to do a preliminary competition for Nationals considering that it's been so long since she has competed.
Alissa herself is not a competent judge of her own readiness, given how poorly she skated at a competition a few weeks before Worlds 2012, and then went on to skate even more poorly at Worlds. She also believed she was ready for Nationals 2013, but her hip gave out just weeks before that.
Last year, Alissa did not do Regionals or Sectionals but she didn't have to, since she had been 2nd at 2012 Nationals. I am sure USFS was monitoring her during her first recovery period, and is probably monitoring her now. If they do send her to SA without her doing any summer comps, it would be because the private monitoring sessions cleared her. However, USFS also cleared Michelle Kwan in private monitoring sessions before 2006 Olympics, and we all know how that turned out.