I'll happily agree with you on flight times but some of these top acro multicopters now have thrust to weight ratios around 14 to 1. That is based on the entire flying weight, not just the motors. e.g. 14 lb thrust in a 1 lb. model.
Maybe that thrust to weight ratio also exists in glow powered fixed wing aircraft too but personally I have not seen one. Would love to if anyone has a link?
https://www.youtube.com/watch?v=d6sz8bquB50