There's an entire genre of fantastic arcade/versus puzzle games not named Tetris. And that whole genre lies forgotten in ruins now. The one game that survived the longest was Puyo Puyo, but ironically, you can blame Tetris for killing that IP in the end.
I wish any developer luck in trying to do anything at all with this genre, give me something new and I will be first in line to buy ten copies. But I don't think Pajitnov, or anyone else for that matter, will ever find even 1% of the success Tetris did. I just don't think audiences still want this genre anymore, they just want Tetris and only Tetris.
It depends. Of course it's fine to have no opinion about, say, which sports team should win the big game, because that doesn't matter. And even on bigger issues like fiscal policy, it's okay to just admit you don't know enough about a complicated subject to have an informed opinion. While I do think it's important to educate yourself as much as you can, no one can reasonably learn everything about everything in order to have all of the right opinions all of the time.
But some issues are both important and clear cut. Like, if someone says they have "no opinion" on whether LGBTQ people deserve equal rights... no, no I will not accept "no opinion" as an answer here. You don't need to read mountains of theory to disavow bigotry, and if anyone tries to give an excuse for why they won't, I'll consider that complicit.