Yeah, I hear what you're saying. Every time I go to Wallyworld I go down the aquarium supply aisle to check on the bettas and make sure no fool has put two of them together (like I found them one time) and unstack them so a bit of air can at least get in those tiny slits they call ventilation. Fool that I am, about every other time I leave with another betta too. And you're right, the CTs in particular are just sooooo tiny! But mine are
doing well, have lost one through my own ignorance and none since.
And yes, as much personality as these little guys display, I do believe they must feel sadness and maybe even despair. Thank you for saving another one.