That's different, i'm all about increasing the choice. Having a disc mount on frames adds very little cost to the frame and opens it up to a whole range of riders. That's why i'm happy to see that Onza have put a disc mount on this frame, even though most people who ride it will use a maggie, but even if the frames sales increase by 10% because of it it's worth it for Onza and it's good for the trials community who use a rear disc as they have more of a choice.
It's kind of a win win situation.
With regards to Alis attitude...
That's right, the problem is you make negative comments when you don't like something in a situation where you shouldn't be commenting at all. Do you ever see me leaving negative comments about a new 26" frames' geo, or how I don't like some newly released v backings? Never, because I've never rode stock / vee breaks and know nothing about them. Take the comment you left in this thread for example, instead of just saying it was a nice looking frame, you had to go in and say "but that geo is not my cup of tea, the old python was the worst bike I have ever ridden!" It's like being asked to come try out some new beers and telling them you don't like any single one of them rather than just saying "i don't drink and i don't like beer so it would be useless for me to comment on them".