Actually it is my observation that MOS users gatecrash AOS4.x discussions a lot more that AOS4.x users invade MOS discussions. AOS4.x users seem to be better behaved.
I really haven't seen much decent interaction between either of these groups.
Then you've got a few people interested in both products (AmigaDave, myself, more than a few others) that still have the opinion that one is better than the other.
We can hardly be blamed for voicing that.
I myself would love to have more experience with OS4, but at the current price levels that the hardware goes for I'll stick to demos of friend's machines.
And as to OS4 users 'invading' MorphOS threads, they're welcome at any time. We (unlike others) don't suffer via fair comparisons.
In fact, I think the only people we look over our shoulders for are the AROS developers.