But it also gives an fixed "end-point". You reach the end and can choose to switch to another character or even to another game. Why would you want to be tied down to 1 game months on end? Especially if grinding daily/weekly for very minor power gains. Sure it's 0.1% more power than you had last week but it's only after 10 weeks before you actually see a 1% increase in power.
More fun? All I saw was more burn out. Grinding endlessly for that AP and doing "chores" because maybe if you're lucky, BLP will reward you with a good legion legendary instead of the many shit ones. Eventually this became less of an issue once a currency was offered so you could literally buy the "right" legendary. But then that just shifted the game back to WotLK welfare badges... Go do X for Y currency to get Z gear. Repeat as necessary.
Your math is wrong. We got 8 DF dungeons so far. Granted only 4 of them are M+ but even with the dungeons in Legion (including ones in later patches), not all of them were M+.
For instance, Violet Hold was NEVER a M+ dungeon. Additionally, you're missing the larger point of why we only have 4 (DF) dungeons in the M+, aka Dungeon Fatigue. Legion, BFA and SL suffered from running the same dungeons (in M+) over the entire length of the expansion. At least in DF, we switch out the 4 DF dungeons for the other 4 DF dungeons in the next season.
BiS trinkets will change, we'll need to find the "best" routes for the other dungeons. Will Brackenhide be the F tier dungeon for season 2? Or will it be Uldman?
Suramar the rep gated zone? Where you needed to do your daily chore of farming for rep to advance the storyline? Also that rep had to be farmed on MULTIPLE characters because it wasn't an account-wide unlock (until later patches).
Has Mythic Raiding ever been open to cross realm at the start for any expansion when the raid was new? Remember SL Season 4 was a special case and technically the "fated" raids were no longer new.
Maybe not a zone but there are areas in each zone that are end-game or at least lv 70+ mobs where you get killed if you go when not 70.
But no artifact power grind either. As much good artifacts are in aesthetic design they also had a horrible AP grind attached to them.
You take that back, those tuskarr backpacks are great. Joking aside, Trading post offerings are bringing monthly wares. And yes progression through trading post is easy but that's the point, accessibility to a wider audience instead of just the no-lifers.
The problem is that some players (like yourself) want WoW to be the all-encompassing game that you spend all your time with. But that is no longer feasible. There are way too many competing games (and other stuff) that is vying for players attention and instead of tying you down to WoW, DF allows you to be finished (for now) so you can go do other things and come back when they have more content for you.
That's a good thing. I think many players would like to be able to reach a fixed "end-point" so they aren't FOMO stuck in WoW.
Additionally, if folks want to continue to compare/contrast DF to prior expansion do realize that you're trying to compare a new expansion to older ones where you've seen all the "extras" they've added.
Circling back to the dungeons bit - We know DF is getting another mega dungeon. And that dungeon will be split into 2 for M+ which expands the M+ pool by 2. Sure it may only be 6 (DF) dungeons + 4 older ones instead of what was done previously in SL, BFA, and Legion.
Moreover, we already know that the Dracthyr starting zone will become an end-game zone in a future content patch. Along with (possibly) an underground zone (Deepholm 2.0?).
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Sure that's some of it but it also means more "chores" to do. Think about it, if TF can propel an item to Mythic Raid level (or whatever the highest gear level there is) and it can proc from any source of loot drops. Determined players will do ALL the content repeatedly for that chance of player power.
Just look at the lengths players are going to now for farming Sparks paired with farming up concentrated primal infusions for basically 418 gear. Sure it's not as high as loot from mythic raid from the end bosses (I think that's 424?) but players will do it.
Realize that wow players (especially min/maxers) will suck the "fun" out of any WoW system to gain as much player power as possible. This is why we can't have "nicer" things in WoW.