That's actually interesting, wouldn't mind giving it a go, anything else notable that you found?
I'm pretty hardcore into GMing OSR sandbox play, and so I was surprised at how much Morrowind, especially when PTR's landmass extensions are added, matches pretty closely OSR design philosophy. In the ACKS II Judges Journal it talks about how to create proper compelling sandboxes, going into detail on how much POI content like dungeons and lairs you should place in your sandbox so that your party can reliably advance from 1st level to 14th. You should include some redundancy as well because people like having options and not feeling railroaded, and also because party wipes are always a possibility. It also talks about dividing the map into lawful (Ascadian Isles), neutral (West Gash, Bitter/Azura's Coast, Grazelands), and chaotic (Molag Amur, Ashlands, Red Mountain) zones, to give texture and the feeling of adventure. (Skyrim and Cyrodiil are too flat in terms of danger and mystery. You never feel like you're leaving civilization because the settlements are all evenly spaced and each county/hold is equally safe.)
This probably sounds like obvious game design 101, but I see a lot of GMs and game devs fail at basic sandbox design like this. I love Skyrim, but it's always bugged me how badly it's paced from a leveling point of view. It's difficult to play a "pure" one-faction playthrough from level 1 to ~60-80 max level, you'll invariably have to dip into other questlines sooner or later. Replayability is hampered because every character will have to go through the keystone dungeons like Bleak Falls Barrow, Ustungrav, Saarthal, etc, and it's made worse by the fact that they're more detailed. I feel like I can draw an accurate map of Bleak Falls Barrow from memory by now, with all its stupid setpieces like the frostbite spider nest or the spiral staircase with skeevers.
The only real keystone dungeon I'd say there exists for Morrowind would be Addamasartus? After that you'd have to go out of your way to repeat dungeons on playthroughs. My last playthrough was as a Breton Nightblade doing hybrid Mages/Thieves guild. In vanilla Morrowind if you wanted to play a faction it was pretty much guaranteed that you'd end up doing most of its content, since there was just the three House cities (Balmora, Ald'ruhn, and Sadrith Mora) and Vivec. But with PTR, since the mainland factions aren't separate, it means that there's redundancy and you can do multiple wholly different playthroughs with the same character class/specialization. My Breton Nightblade did Ajira's intro quests in Balmora but then did Old Ebonheart's Mages Guild -> Firewatch -> bit of Narsis. My next mage playthrough as a Spellsword I'll try out Bal Foyen -> Almas Thirr -> full Narsis, and might do either Legion or Fighter's Guild as well. Point being that the sheer abundance of content and variety is just very exciting. Each new release only multiplies the possible combinations. Modded PTR Morrowind for me is the ultimate dungeon crawler.
I really liked a QOL mod that was included that gave you a book that auto-updated with the names, skill levels, and locations of trainers that you met. The whole meme of "games where keeping a journal/notes is necessary" I feel got a bit too contrarian and reductive in reaction to modern guided open-worlds. Having tedious things that don't require any mental effort be automatic is fine IMO, that's stuff that every PC would logically be doing. Where there's a natural chance of failure, like with navigation or putting together quest clues, then I think that you shouldn't be handheld by the game.
Some of the quest mods in Total Overhaul were shit, though. Would not recommend Lord of Rebirth or that Peryite quest in Caldera.
Can't think of anything else, really. It speaks to how good vanilla Morrowind's fundamentals were that "basic" content addition mods like PTR fit so seamlessly and enhance it so smoothly. It's good and all, but part of me is a little bit resentful that mods for a 20+ year old game is all we really have for this subgenre. Not a single proper Bethesda-like competitor has been made in all this time.



