I guarantee that I have more fun with pool than most. My opponents do, also. I don't really play tourneys anymore and don't gamble. There are about ten people I will even play with, six of them are my closest six friends in the world. The others are guys who don't feel the need to gamble to play their best game.
Having fun and playing tough are not mutually exclusive.
A little story: One of the top ten women's foosball players in the world was a very close friend of mine. She once won a tourney playing with the number one woman in the world. In the finals my friend was nervous, stressed, and frazzled. Well into the final set, The opposing team took a time out, and the #1 woman turned to my friend with a huge grin and said, 'Isn't this fun?'
I think people forget that too often. The one session of APA I played I had a teammate who took a timeout and asked for my advice (I was the only person she ever asked for advice, and only that one time.). She started off by asking me to listen to her ideas before giving advice, etc.. She was very self-conscious. I listened, pointed and out the pros and cons of her ideas. She said that the part that helper her the most was simply two words at the end of the timeout: 'Have fun.'
I agree you can have fun and play tough too, but that's not what I was meaning in my response. Your example shows they were under a serious match. Hell it was a final, and not some casual practice game. There was something on the line. Trophy, money, bragging rights. Playing a 3foul to win another game and get you closer to winning the match would be expected (if the 3foul were reasonable option). Not in a casual practice game as part of practice itself. If you play solid safeties in practice in appropriate situations, then 3fouling makes sense. But to do it from the get go is probably not a good practice habit. If you look at one of my other posts, you'll see I compare it to trying to "practice" getting the 9ball on the break, when you should be practicing the other aspects of breaking. Ball in a pocket, CB in a good spot, workable ball spread, or shot on the next ball.