I've been thinking about how to word this right.  Loose and relaxed is good.  Sloppy isn't.  But I've been a proponent of relaxed, good form, accurate striking for a long time now.  I think the 110% effort super power bomb is over rated and very inefficient.

What the Diaz brothers do extremely well, in my humble opinion is to put, slightly lighter, well placed well timed strikes on target in a relentless and methodical manner.  They remind me a lot of Ali in terms of their patience and execution.

This is what many MMA fighters lack in their striking game.  Most try to end it with a one shot, one kill mentality.  It's not wrong.  But it's kind of like the .45 vs the 9mm debate.  If you can put your .45 on target quickly and effiently then by all means, that's a better caliber.  But if you're thrown off balance by the heavier shot, and can't control the recoil or be accurate enough to generate hits on the vitals, maybe the 9mm is a better choice.  Heck, 10 .22 lr rounds on target are much more damaging than 1 .500 cal that misses.

In the gym we say 80% = 100%.  80% power is actually 100%.  That little bit of relaxation makes it a lot harder for your opponent to read your attack, it makes you faster, and you can probably throw 3 to 4 80% strikes for every 100% strike in terms of conditioning.  Very few MMA fighters are able to discipline themselves to do this though.

But not everyone shares this view.  And they have some viable arguments for their case as well.  A great example of the contrast of these two methodologies is the fight between Takanori Gomi and Nick Diaz.  It was one of the best MMA fights of all time if you ask me.