I think all of these are good. Nadu especially. Didn't see Extortionist coming but that is also probably a good idea.
They hit more fast mana artifacts, which are going to continue to be a problem for EDH as they continue to print more powerful cards. I thought the comment about Sol Ring was interesting:
We should also talk about the elephant in the room. We're not banning Sol Ring and have no desire to. Yes, based on the criteria we've talked about here, it would be banned. Sol Ring is the iconic card of the format, and it's sufficiently tied to the identity of the format that it defies the laws of physics in a way that no other card does. Banning Sol Ring would be fundamentally changing the identity of the format. We aren't trying to eliminate all explosive starts—it happening every once in a while is exciting—and removing the other three cards geometrically reduces the number of hands capable of substantial above-curve mana generation in the first few turns.
I would like to see Sol Ring banned, partly because it's an obviously overpowered card and partly because it reduces space in your deck. Your options are to accept that the real deck construction rules are "Sol Ring plus 98 cards", or to accept that you're voluntarily building an underpowered deck, neither of which are satisfactory IMO.
That said, I think it's interesting that their logic for not banning Sol Ring echoes the reason why I thought Gush shouldn't have been banned from Pauper: it's "the iconic card of the format", and telling people that they'll get to play it is a good advertisement for the format.
There are other staple cards that belong in every deck. Command Tower being the most obvious. Similarly, Fabled Pathway. Most commander decks have several of the similar but weaker cards like Terramorphic expanse. I guess it feels less impactful when it’s lands. Also obviously monocolor decks don’t need these lands.
That's actually a very fair argument. Except for some mono or 2 colour decks, it runs great in all my decks. It is such a staple that removing it is bad.
Maybe there shouldn't be cards you "have" to have. Even boots or signets are okay to omit in alot of decks.