.......... I would however never claim a point under these circumstances if the ball was clearly going out. I like to win by winning, not by technicality.
Me too, but not for every rule. For example, touching the net. I say call it every time.
One rule (in USTA League) is you may not leave the court once the match starts (except maybe a bathroom break and between 2nd and 3rd sets). Anyway, my opponent broke a string on a first serve in the middle of the match. He had a second racquet in his car, but not with him. Although he wasn't allowed to leave, I let him (didn't bring up the rule) and when he came back, he asked for a first serve! That's two rules he broke. I didn't object. It was a long walk out the club and to the car and back. Probably 5-7 minutes at least. A player could get cold/stiff while waiting for the guy (who's walking/jogging) to return. A disadvantage some would say. But like origarm says, I to want to win by winning, not by technicality.
Another example: I want to play my match. I don't want a walkover against a late player. In USTA it can be hard to make it to the location if you work till 5 and the match is at 6.