Woot, more jungle cyrodil! Even if it requires reverting multiple retcons between oblivion and ESO to justify making it a propper jungle region
That said, I also disagree with the comprimises to lore for playability not just on ESO but other games too. Like in skyrim how you can actually control your werewolf form freely with some questionable justification of making a deal with hircine-since simply being a werebeast condemns your soul to his domain, not to mention other werewolves lack contol and even the circle lacks the players control. Used to be you had to eat a black soul every time you transformed or you grew weak and eventually died.
Alongside that, the vampire thing of having most debuffs removed such as death by sunlight and other things. While they've tried to give this or that justification for it, they've really just dumbed it down too much to have a point for gameplay reasons. Course as soon as ESO was announced I already knew that vampires and werewolves would be straightforward with no real drawbacks, at best would be weakened to the point of being more cosmetic. The idea of making an MMO where something hindered the players for their choices is a pretty foreign idea these days.
Alongside that the fact that the nordic pantheon is mentioned in skyrim but only in tangent. The imperial cult of the eight divines, founded by allesia, was a cult that combined the 8 aedra that both the nordic pantheon and elven pantheon shared. Both sides had other gods as well, and while this was meant to be common ground between them, both did cling to their own variations even if the strength of the imperial cult allowed them to see a common ground in diplomacy and such. However, there are also other gods, lorkhan is basically the devil of the elven pantheon, known as shor in the norse pantheon. Alongside that even after overthrowing the dragons aldiun was still revered as a god by the nords even into the third era, just an evil god who sought to dominate and destroy and who should be feared not sought after. Ysgrimmor is referenced as an oath-and justifiably since he was raised up to godhood after his death much like talos. Ysgrimmor and the founder of the mede dynasty both basically were the men who became gods before talos, and in fact talos while recognized by the cult wasn't the primary god of men throughout the cult. In morrowind your actually charged by the imperial legion to slaughter an entire coven of talos worshippers-apparently they want to kill the emporer for being unworthy of the throne of tiber septim.
That said, skyrim does hide the truths of the lore well even if a lot of it is streamlined. The imperials have but farmer conscripts because all the imperial legions are on the southern border preparing for war, though apparently a note appears in a fort to the south if you follow the stormcloaks questline saying that when the pass thaws a full legion is prepared to march and subjigate skyrim once more-a propper legion that tulius always pines for. Alongside that there are indications in various places such as the fact that the thalmor consider ulfric an asset who is helping their war efforts ever since they released him from captivity in the great war. The more humans who kill themselves the slower the empire can repopulate it's legions-and the only thing humans are supperior at to elves in cold hard numbers is reproducing. A single elf warrior from birth to becoming a graduated warrior basically has lived through 3 generations of humans. That's a lot of time for extra sons. Alongside that it also indicates the thalmor agenda which is remove the worship of talos, so he's too weak to prevent the genocide of all humans, so that their faith doesn't interfere with thalmor killing auri-el, which then will unmake time so that lorkhan's betrayal never happened, and they will return to their status as gods.
I'm less familiar with ESO's lore contributions, but I imagine it does add some good things. Like I hear the deadric pirate trapped below winterhold in an unmarked quest is a boss battle in ESO at the anchors. Though I still didn't expect them to frame the games main quest as you the PC being the one chosen hero who can save the world-since that loses a lot of narrative weight when there's a million one chosen heroes. Was more expecting something like an NPC to be said hero and you being a tag along for the main quest or something if they went that route. Or perhaps a slightly more sandbox main quest.