Hi,
I don't know if this has been covered, but the post is 43 pages long so....
... anyway, my opinion.
I have used macros and addons in WoW, and they made it an easier process.
I know this post is specifically about macros and while my objections against those are less than addon, they are there none the less.
It's like this. If the healing/tanking/dps is too difficult without macros, then it's not balanced right, and that needs to be addressed.
Within WoW they took the attitude if the UI is broke we will let the community fix it (and then cherry pick the best ideas for inclusion in the main UI). The problem is it's not a universal fix, and is not compulsory.
Basically my opinion (and it is just that, I'm not saying it's any more valid than yours) is that if its not possible to do something without custom functionality then fix it for everyone or not at all.