So, is it uninteresting to develop your skills? Is it uninteresting to learn? Is it boring to strive for improvement in the game? Then what is the point of Tournaments at all? It's a competition. And if you don't strive for victory and just think, "maybe I'll play," then it's probably easier and more convenient to just play against the AI for your own enjoyment. Or maybe use cheats to have 20 black creatures on the first day, so it's easier... :)

What do you mean by "uninteresting"? I probably haven't explained it clearly enough. There are two groups of players.
The first group consists of regular Tournament participants – the "fans" of the game. They strive for development and improvement, they know the game inside and out, and after they've learned it, they start improving it, creating Equilibris, and playing on it.
The second group consists of those who just play, maybe one-on-one against the AI, maybe with cheats. But at some point, they go online, see that Tournaments are being held, and start playing. Then, many of them become decent players and move into the first group. But, in order for them to grow, you shouldn't immediately exclude them because of the version. After all, 90% of them won't bother downloading and installing Equilibris; they'll just go where they can play in the more familiar versions, the ones they already have installed on their computers.
There is also a third group – these are players of other versions who simply don't have the time to figure things out and improve in the game, especially to learn a new version. But they sometimes play, just for fun, or for other reasons. Or, like here, in a Tournament with five matches. Those who don't know Equilibris are immediately excluded from the contenders.
In general, if you're holding Tournaments for specialists in the game, then, of course, you should play on Equilibris, but if it's for everyone, without discriminating against obvious "losers," then you should play on the standard versions.
Note that I have nothing against Equilibris, but if official Tournaments are held on it, I suggest immediately starting a parallel thread about moving official Tournaments to the Third Edition.