RE: Why can't we simply increase tank size for more flight time?
Agreed with bbbair. Plus, it all does depends on what type of flying you do. If your only goal is to fly circuits around the field heck put two tanks in, you’re not going to notice or care that you have a brick for a plane.
However for those that are putting a plane through its paces and constantly expanding the boundaries of there abilities don’t care to have expanded flight time. After 8-10 minutes of getting your adrenalin pumping… Need to stop and take a break anyway.
To me if you don’t feel mentally spent and ready to land after a 10 minute flight you didn’t fly fast enough, low enough, or bold enough.