I'm going to respond to RoninPimp first and then Andrew Green.
RoninPimp:
1) Tiny little MMA gloves don't take much off of a hard strike. Spar against a good striker wearing them, and let him step up the power to feel what I'm talking about. "Non-punching striking" is unaffected. Hammer fists and palm strikes with the gloves are exactly the same. None of the glove covers those areas with padding.
Palm heel strikes are decreased in power more than punches, IMHO, and any hope of an effective slap is dead with the gloves - the force area is too spread out. Hammer fists are affected about as much as punches.
-IMO: 4oz gloves protect the striker more than they hinder him.
In terms of long term health to the hands, I would agree. In terms of the match, I don't. Make the darn gloves optional again and see who wears them.
2) No argument from me on this point. But what can ya do? Fighter safety is very important. This effects every fighter equally though.
I don't think this affects all fighters equally. Typically strikes the the groin and throat were delivered by the TMA and streetfighting people in the first UFCs, and it was the same deal in the AFCs from the clips I have seen. I don't think grapplers would use these strikes as often, although there certainly is opportunity use them on the ground if they so choose.
3) There is old video of Brazilian fights on hard surfaces. The striker only guys from that era didn't do any better. Usually the ground and pound guy is landing on the person he's taking down. The surface doesn't matter to him. The striking power is reduced a negligible about.
The softer the surface, the easier it is to get someone on the ground - ask any high school wrestler. Takedown defense is affected alot by hard surfaces. So is stand up striking ability. To the gnp purist (Coleman) this is largely a non-issue. To anyone else, this does matter. Pushing off harder surfaces gives more power to strikes. Also, no strike-and-throw strategy will ever work in the UFC/PRIDE world because the ground is too soft for the throw to finish people. This could have been a very viable, if also extremely unsafe strategy.
-IMO: A soft surface helps those getting taken down.
When they are landing, yes.
4) While possible, it is very unlikely. It has even happened in competition. I can't remember that huge Brazilians name though. It would change very few outcomes. But again, like you mentioned, fighter's safety is critical. Without descent safeguards, the sport goes away.
If this were ended, this would cease to be a sport and turn into brawls again. I would bet alot of the fighters wouldn't want to work with this and for good reason. However, it would have changed the outcome of some small number of matches with truely determined strikers.
5) Very few, if any fight outcomes would change with biting allowed. If a striker is in a bad position from a grappler, he's in no position to bite to escape. He better umpa or shrimp and recover guard if he wants to survive.
Generally true. This isn't the be-all and end-all "anti-grappling" some TMA people make it out to be. However, it could have given a bit more of an ability to survive to those who are, especially, mounted and in half-guard. Occasionally, it could have stopped a long-coming RNC from getting in. I'm sure a couple of leg locks could have been foiled, and with every one of the tug-of-war armbars (kinda rare, but you remember when someone is on the side with an arm and the defender has both his arms still holding together and his face right by the arm-barring guy's legs) would have resulted in a few bites. All in all, this wouldn't have turned the MMA world upside down, but it would have helped the strikers a bit.
6) This could go either way. Maybe a grappler has just thrown a striker. He doeasn't get to kick either. He doesn't get to heel kick fro the guard either. Takes realism away for fighter safety.
Definately an important aspect of fighter safety in the UFC, but this still affects strikers more.