This is not true for FO3. It is true for TES4 that esm's can't override esm's without massive problems (which would seem to be one of the primary reasons the SI has been done by merging it into Oblivion.esm and the other DLCs are .esp's)
In Fallout 3 engine changes (and especially the introduction of the ONAM subrecord in the file header of ESM files which lists the contained overriden FormIDs) change this behavior. There doesn't seem to be any problems with esm's overwriting other esm's (as long as that ONAM record is correctly present) which can be seen quite well given that the 3 DLCs are all esm's, all overwrite records from Fallout3.esm and that seems to work in general.
You know your stuff but when you say in general, what exceptions are there?
I mean if Tarrant can find a bug and he knows what he is doing more than most people, what exception might of caused it?
I've said it before and I'll say it again.
BATCH ESMIFICATION.
We know how to manipulate the ESM header flag. It can't be that hard to make a little program that en masse converts all ESPs into quasi-ESMs and back (for GECK purposes). And from the sound of it, ESMs are spared these bugs. The only issue is that load order will have to be watched as there would effectively be no more "ESMs Load First" safety net.
It would certainly be a whole lot easier than Persistent-izing every ref.
As tarrant has highlighted and I have often said myself, this will cause problems, it would solve a percentage of them but ESMs do have some quirks themselves.
I am interested to see what would happening running 50 big masterfiles, my gut tells me crash after crash, because in previous titles that might well of been the case. If we go this route it really is a matter of crossing our fingers.
I didn't see this in the forums, where'd it come from and when? Cannot find it either with searching.
I think the poster is referring to the initial comments made when the bug was highlighted, if I am not mistaken.
If so then they were not an official decision, just helpful pokes to try and get around the bug.
Well, they're gonna miss out. Fake Patch Supports BS now. No need for 1.5 unless you wanna be picky.
This is great news
-edit
Apologies for the double quote.