Nintendo directs are not done as some gift to the fans or anything. It is a marketing tool.
Like press conferences of old, they are designed to make people aware something will be announced. Make sure their eyeballs are there.
More importantly, the format gets people to view ads (really what they are) for things they may not otherwise have done. You go into a direct thinking "hey maybe there will be a new Smash or Mario game". Then while you're watching for that, you wind up seeing something like Rhythm Heaven you may not otherwise have been interested and you go "oh hey, that's kind of cool". By encouraging people to watch a "show" rather than discrete trailers, they wind up watching more.
This really anything new, just a new format for something tech companies have been doing for decades and decades. Just modified to bypass the press and go right to the fans. It's a format that obviously works well, which is why tons of companies are doing it.
To the extent that some people on the internet are disappointed, I'm not sure why anyone, especially Nintendo, should care about that.







