Aren't we all training doing MMA?

No. MMA does not mean combining more than one art. That is a common practice today, but that doesn't define mma.

MMA is a sport that allow peope a variety of martial arts styles to compete under one umbrella. Prior to its creation a judoka did not compete against a karateka or boxer. But under the rule set of mma a boxer could compete against a wrestler or judoka or karateka.

Since the rules allow for a variety of fighting styles people have decided that they should learn a variety in order to be able to defend against any style. The Gracie family had a lot of early success by

using a fighting style that many of the hand picked competitors had not experienced before.

Depends entirely on your definition of a Mixed Martial Art.

Karate WAS a Mixed Martial Art developed by mixed martial artists but has since evolved into it's own style with it's own skill-set and flavour that has been handed down (in some cases unchanged) through the generations. It's hard to define something that hasn't taken new techniques and methods for a few hundred years as "mixed".

Personally I don't think you can call something a Mixed Martial Art unless it's being added to. In my opinion most MMA schools are teaching a singular style and the acronym MMA (Mixed Martial Art) is a bit misleading as some of the schools haven't changed a thing in over a decade. As JW pointed out the rules haven't changed much in that time so neither has the skill-set. Most practitioners are receiving similar training which in my mind makes the style singular.

There you go. My answer is if it hasn't recieved any outside influence in over a decade I no longer class it as mixed.

In a way yes but not really. A principle of MMA is that it does not hold itself to one system. While karate has things mixed into it it still uses only that one system and is not open to other techniques. MMA does not care about tradition or system, they take what's good and leave the rest. And to counter some of the uneducated points by other people. In the early days of MMA there were no rules so the these fictional rules did not "make it possible" for a boxer to be successful. Also that the Gracie's took only people who didn't know their style. Complete BS. They took all forms including hapkido, judo, karate, TWD, shoot fighting, and many more. In Royce's first fight he took on ken shamrock who was one of the best ground fighters of the time. Also that competeors were hand picked. Yes they were but they got the best they could get and all of the fighters had very impressive MA history.

I don't train for use in a ring or a cage, so no, I'm not training in MMA. All my styles are complete, and do not separate aspects such as ground or stand up. I'm not "mixing", I'm incorporating things to expand my own knowledge, skill and ability. It's for my self, not to reinvent to wheel.

MMA is a sport, not a philosophy. I'm not training for sport let alone those specific rules that's conducted in MMA, ergo, I'm not participating in MMA.

Well, no one trains in a pure art, all the arts are mixed, it adds to their strengths, as mixing metal adds to strength. I do not train to fight in a cage, or for sport. I train for self defense. by my understating of the definition of MMA, I do not train MMA. I train in a more traditional manner.

No.

Allmartial arts are necessarily "mixed", as everybody has had more than one teacher.

However, MMA is a term used to describe aq modern fighting sport.

jwbulldogs gave you a great answer, and I agree with him.

I agree with jwbulldog

Yes all karate styles are mixed but we are not a sport and have no rules

MMA and Karate are two separate martial arts. Your argument is invalid.

yes