Yeah I wrapped the discovery tour up and considered the game done, was worth a playthrough but the game has a few flaws and shortcomings and I am a bit mixed on the RPG mechanics particularly once they expanded the level range from 50 to 70 and then 99 though regular playthroughs will probably end well before these are hit even with the two actual DLC episodes and the dozen or so Lost Tales and I am pretty certain Ubisoft also heavily reduced rewards from player created quests made with the intention of getting a lot of money and XP quickly.
Near the end of it all there was mostly a daily ore quest plus the weekly challenges which the two current tables helpfully reduced to a minimum amount of work and seeing how pieces could be completed.
(Almost nothing as it turns out, missing one or two bits for every armor set plus a few weapons and most of the mounts curiously enough.)
Bit of fatigue over the year or so and the way the content is delivered monthly but the base game and the two episodes had their moments and the lost tales could occasionally be quite good though the gameplay itself and other issues means it's probably not going to be replayed anytime soon although these large service model open world games that Ubisoft in particular are now going all in with do tend to drag after a while but the tables and trainers and other utilities or mods can reduce some of the extras like the extensive grinding should players want to do so.
Pretty sure the same extends to discovery though I am not sure if it's as simple as a incremental value and setting it high enough registers as having met all the points of interest and there's probably a bit more to it for the main tours and such, neat little addition but from the main game itself you're basically made to travel throughout most of the game world one last time even with fast travel to existing sync points and the main tours easing the journey there's still at least a couple of hours for anyone wanting to clear them all even with skipping through the history lessons.
From a quick check in on Origins I do like the little additional touches and details the game has although Odyssey expands on some of the mechanics as well but yeah it can be a bit of a drag or fatiguing trying to actually clear these even if it's not 100% hitting every question mark on the map or something along those lines.
Glad to see the current tables and such holding up over several patches too now that we're in this system of a year or so minimum of support and some 10 - 15 patches or more and a mix of both free and paid and premium content.
(Fairly customizable too for how much one would want to use or set certain gains like for experience or money.)