I'll respond here, because they are trying to keep the feedback threads on topic, which is probably a good idea.
I agree with you, nutrax. Tags, "helpful answer" buttons, "popular thread" sidebars are not necessary to make a community.
It seems to me that they have misjudged who the people are who use TT. One of the great things about TT is that it attracts such a diverse bunch of people, not only from different countries, but also of a very wide age range -- as far as I'm aware at least 16 to 90 -- and background. Many internet forums are inhabited by young tech-savvy hip groups of people. People who not only use internet technology to do whatever it is they want to do online, but are also interested in that technology for the technology itself and aware of what techniques exist out there. Looking at all the bells and whistles of TT4 gives the impression that it was intended for a group just like that.
There are many forums that attract the kind of group for which TT4 seems to have been designed. But this isn't one of them. I'm willing to bet that TT has many users who aren't regular users of any other forum. Who aren't the kind of people who hang out on the internet hopping from one forum to the other, and who really don't care that much for the wonders of 'Web 2.0' (that's tag clouds, wikis, plugins, extensions.) All these kinds of advanced user options are great add-ons for those who like that kind of thing, but (a) they should detract from the basics; and (b) they shouldn't be implemented before those basics are operative.
Already in the days of TT3, there were always questions from people who didn't understand changes in thread order (recently replied on top vs. recent posts on top), how to change time settings, how to put a link in a profile, etc. Not everyone knows how to do these things, and not everyone has grown up in a world with internet and is used to clicking around looking for the right menu options. And why should they know? An interface should be intuitive, especially when you want it to be open and easy for everyone.
There are some functions that are the bare minimum for a functioning forum. Anything beyond that, that isn't immediately obvious might add a bit to the enjoyment of those in the know, but at the cost of losing users who feel intimidated by this technology. And so I'll argue that all these so-called community-building features have the opposite effect of creating a community. If anything, they can cause divisions. They create a class of users who go crazy gaming the system with tags and links, and a class of people who are left behind like a hitchhiker on a highway watching the fast cars race by.