I'll agree and disagree with this. Perhaps this'd be better suited for its own thread, but I'll comment here for now. IMHO, I think both are valuable, both meaning the generalist and the specialist. In the specialists 'area' of specialty, yes, they're probably going to be the superior person. Ex: A stand up guy being placed in a strictly BJJ 'arena' yes, the BJJ guy will most likely come out on top. OTOH, in the early UFC, we saw strikers fail to survive against grapplers. They weren't in the BJJ guys 'arena', they could've done anything..punched, kicked, you name it, yet they seemed to fail.
I consider myself a generalist. I consider my training to be well rounded. I do seek out specialists to improve on my skills in a particular area. However, the difference between me and some other people, such as the OP of this thread, is that when I train in something, I usually dedicate alot of time. In other words, I don't go to a school, train for 2 mos. leave, go to the next place, stay a year, leave, go to the next, stay 3yrs, leave...lather, rinse, repeat. Furthermore, I don't make myself seem like an authority on things that I dont know. Now, OTOH, I've gone to seminars in arts that I don't regularly train in. I've done a few Pekiti Tirsia seminars. I've learned a number of great things from that art. However, I don't teach those things, I use them for my own personal training. Those were things that I took, things that really caught my eye, and things that I've drilled repeatedly, in hopes to remember and add to my toolbox. Yet, I'd never, after a 10+ hr seminar, talk like I was a PT expert.
But to each his own. In the end, it'll be that person that has to answer for his/her statements.
There are other angles to it, though.
Which is, of course, why it needs its own thread. When I trained ITF, I specialised in Kicking. But when I did some Boxing, I found the transition easier than I expected. Since then, Ive found Im simply better at punching, regardless of where My training was specialised in the past. This isnt something that developed, this is something I experienced on Day One. And i was able to hit people vastly more experienced than myself with those barely trained punches. Granted, they hit back better, but it was more than the other beginners could say. So, what happens when You have someone who happens to be quite able to jam the hell out of takedowns? Or finds themself surprisingly comfortable throwing someone around? Im of the opinion that they didnt survive well against grapplers due to the lack of common awareness of how grappling works. It was a new flavor on the scene, and it speared itself in thoroughly. The Grapplers were Grappling, and the Strikers where trying to power out, and failing. But nowadays, it seems like theres progressively less and less groundwork. In the matches Ive been watching, anyway.