Another Thread Locked

Question

"new intel imac 7.2 where have my plugins gone!!!! argh"
seemed like a reasonable one to me, though the last post said something like "internal logic AUs are good, but I can't use them" which isn't correct. First, Logic's plugins aren't AU, second, the Logic plugins in 7.2 should be Universal, third, all the AU's which come with OS X on Intel should be Universal Binaries. I wonder what he was referring to?
The locked thread also discussed performance comparisons between Logic on the Intel iMac and PowerPC systems. Another reasonable topic of interest here.
Uh-oh... I hope I haven't crossed the line...

Answer 1

I don't think it's so bad that the old thread was locked, since an answer to the original question had been established and the thread was accumulating misinformation and complaints. But I'll take advantage of this thread to (1) clarify a comment I made on the old thread and (2) ask a closely related question.
(1) First the clarification: someone pointed out that AUs and VSTs need to be universal binaries to run inside a UB host. In response, I wrote "I don't know about VSTs", but I only wrote that because I was focusing on Logic (which doesn't run VSTs at all, of course). I didn't mean to call into question whether a UB host could run non-UB VSTs; I expect one couldn't.
(2) Now the question: I understand that (ignoring the Rosetta option) an Intel Mac running Logic 7.2 can't host AU plug-ins unless those plug-ins are Universal Binaries. That makes sense to me. But what about Logic 7.2 running on the older G4/G5 architecture? Am I right to assume that Logic 7.2 running on a G5 (not an intel Mac) can host the same non-UB AUs as Logic 7.1?
Dual G5 2.0GHz   Mac OS X (10.4.2)