OK. Take fCamera 1.0.5-2 for example, it should conflict with kernel power, it does in HAM; all is well. However, on both FAM and apt it doesn't conflict and allows installation, in most cases this causes a boot loop.
I believe there are other examples of this dependency mess all over Maemo, apt doesn't notice these conflicts and if apt doesn't FAM can't either.
Why waste my time when HAM works?
Another example with screenshots attached below. HAM shows one thing and FAM shows something else, this is the same system, both managers updated. I know which manager I trust to do the upgrade!
It's also very easy to install packages you shouldn't from different sections like libs for example. One without knowledge could easily end up in a mess. Only user packages should be available.
The option is checked as default FFS. Anybody can install this package and use it (it's in extras BTW). I wouldn't expect a complete newbie to be able to get root and use autoremove without understanding it. I could expect someone finding FAM in the repos and using it without knowing what the options actually do.
I don't believe Estel was implying what you present. I think rather, he was wanting to say (yes, his word choice occasionally tends to the lurid) is until now, few if any have bothered to detail the issues, and so the naysayers seem just that.