If the only innovation your MMO has is combat, then its not really an innovation at all. Whatever "innovation" you can put in within that aspect has been done in a single player game, but much, much, much better. No game aspect in MMO's is ever innovative because its a watered down version of what you can find in any number of single player games.
That's why the MMO genre is dead or stagnate. The mechanics will always be the weakest aspect of MMOs--focusing on combat is like trying to say Michael Bay films would be better IF ONLY the action sets were even more amazing. No one sees the one virtue of these games anymore--especially their developers.
Not innovation at all? I must've forgot all the AMAZING, totally not boring combat present in MMOs then! Do you mind naming me a couple? Because prior to Tera, they were all tab-targeting snorefests, except maybe a few quirks/gimmicks coming out of Korean "MMOs" like Granado Espada. Tera started what BDO has almost perfected. So, while you could maybe make the argument that BDO was more on the iterative side, to claim that revolutionizing a fundamental aspect of MMOs isn't "innovating"? You couldn't "No True Scotsman!" harder if you tried. If that doesn't reach your bar for innovation, I don't know what possibly could. Each aspect of MMOs looked at on an individual basis will always be done better in a single-player environment.
BDO is also one of the only MMOs out there offering a
truly open world. Something a LOT of "vets" here claim they want in the MMO space, no? You can literally play the game almost however you want. Want to just be a tradeskiller that never does combat? Yup! Want to breed horses all day trying to breed the perfect mount? Go ahead! Want to be a fisherman that sails out to the deep ocean for the best fish? You can.
There are really only about two (three depending on what you consider standard) "industry standard" things that BDO doesn't have. One is meaningful PvP progression - you can't really PvP "for gear" in BDO, nor can you climb the gear ladder via PvP. The game does force you to engage in some sort of PvE aspect to make meaningful gear progression. It does cap gear score in T1 node wars, however, so you
can PvP without gear advantage making a difference. The only other thing it doesn't really have is "raid" content - at least if we're assuming "raid" content is the classical EQ/WoW model. It did away with the "holy trinity", you can farm/grind whatever mobs you want, many of those locations having rare spawns/drops/"bosses", extremely rare but extremely valuable/useful items that can take days worth of time to farm, etc. "Open-world" dungeons/content designed for group play, etc. I guess there might be a third if you consider "quest to progress" a standard now (there is a point in the game where questing can be an effective method of leveling, but it's an extremely brief window that only lasts a few levels and is still less efficient than group-play). I personally don't, but I could see how some would and you could include it as a third standard the game is missing.
People bitching about having to "grind" in BDO or "running around in circles" killing mobs are the same people longing for the days staring at the fucking safe wall in LGuk. If you hated it in EQ and it wasn't the game for you while also shitting on BDO for it? Fine. But a lot of the people bitching about what a "grindfest" BDO is are the same fucking people who spent 30 hours camping for their SMR while playing every other TLP Darkpaw drops. I fail to see how plopping yourself in a room and staring at a wall while mobs are corralled to you is at all fundamentally different than running around a cave/"dungeon"/open-world area farming respawning mobs.
While none of those systems are obviously innovative systems
by themselves, they've combined a lot of "industry standard" stuff along with revolutionizing one of the most fundamental things present in MMOs - combat. If that isn't "innovative", I don't know what the fuck could ever meet your impossibly high bar of moving the genre forward. By those standards, WoW did nothing to move the genre forward - all Blizzard really did was iterate and "perfect" systems EQ/MUDs had set and the "! questing" system is only innovation in one area! Hell, you could even argue the same of EQ in '99. All Verant "innovated" was moving MUDs to 3D. By your standards, fundamentally changing a singular aspect isn't enough and single player games did it better anyhow - System Shock 2 and Unreal Tournament both released that year, which were far better in the context of 3D innovations.