No it shouldnt because art styles can be copied and are open to viewer intepertation.
There are many people that can paint in the style of Leonardo da Vinci....but the works of those people wouldnt be considered the work of the man himself.
Yes, anime style can be copied, which would also be considered anime in terms of influence. Japanimation has many different styles, but whether if it's from Dragonball or City Hunter they all have distinctive style you found in Japan. Thundercats do have that style, from the look of the characters to the signature kinetic action sequences you usually found in other Japanimation shows, that's why I think they can be qualified as anime. It's like Disney has their own styles, and we can usually trace the look of modern cartoons or shows back to the old Disney if they were influenced by it. I shouldn't have to look up to see who the writer and the producer of an anime before deciding if they can be "qualified" as anime or not.
As for the da Vinci thing...I think modern artists can certainly copy his artwork and styles, just like they can with Monte, Van Gough, and other legendary artists. If we see an artwork that copies da Vinci's signature style, we would give credit where credit is due, and that is da Vinci, not the artist who copies his style, won't we?
funny that you only post what you think helps your argument.
From the first sentence on Wikipedia's page on Anime
http://en.wikipedia.org/wiki/Anime
Going back to the Thundercats argument, I believe its art style can be traced back to Japan, where the style was originated from. That means it should be considered as anime. I don't see how this line contradicts my statement. You think that line means the animation must be made in Japan only, but only applies to the writer and producer, but not the artists.
And one more thing: If writer and producer alone determine whether an animation can be called an anime or not, then Marvel shouldn't have called their upcoming animated series as "X-Men Anime", "Iron Man Anime", etc., since they may have hired Japanese artists who drawn Marvel superheroes in anime style, but the rest belong to Marvel.
Anyway, I think in the end, we can agree to disagree re: this topic.