If they hold true to their word, and really are removing almost all RNG elements, this expansion could be the best one in a long time. Dailies and RNG are the biggest inhibiting factor to enjoyment in retail WoW. Take Legion's systems, make them worse, more grindy, and add more RNG and you end up with BfA. Take Legion's systems, make them better and less grindy, and remove all RNG and you have a recipe for success.
The tower has potential. We'll see how it's implemented. Though I don't get the "Up to 4 people". Was that a typo and it's you + 4 other people for a normal sized party, or are they screwing with normal party size again?
The original artifact weapon advancement itself was fine. You had big power upgrades early on, got another big upgrade when you unlocked the final grind portion of it and then had something to do for small power gains over time. But most importantly there was an end to the grind. You could get to the point you were finished.
The problem with it was it was weapon specific so you couldn't reasonably maintain two specs and gl if you wanted to make an alt unless AK was already maxed (which was also character specific, ugh). Remove those two major problems with that artifact advancement system and you could actually have a good, interesting path of advancement for end game characters.