Because all too often 'tec' is used as an excuse not to fly a lightly loaded sector (voice of embittered experience)!!!!
Not only that, many times the technical problem is known well before departure time, but the respective carrier is too damn disorganized to actually
do something about it...as in, not enough ground engineering staff for these circumstances.
Penny wise, pound foolish, comes to mind.
I say...get these carriers off their mis-informed duffs and have 'em pay and pay....and pay compensation (big time) untill they get their act together.
Period!