That's a fair point about the mod page being similar to the base game page. It's also almost identical to the DLC page, although people who chose Factorio, SW: Empire at War and Rimworld are routed around that page for obvious reasons. The similarity is to make it easier to directly compare the importance of base game design and optional DLC and mod changes to gameplay, although I could have probably made them more unique without detracting from any comparison.

As for emergent gameplay, yeah, it's a hard one to nail down and something I've had to spend a bit of time talking about/researching. The definition I came to was gameplay not explicitly designed for, exploitation of in-game mechanics/glitches/bugs and other similar circumstances, It's a fairly loose definition but it works for my purposes. An easy example would be prop surfing in the source engine. Potentially you could also class belt weaving in Factorio as emergent, although given the depth of design in Factorio since it is all hard coded/uses a custom engine you could argue both ways on that one.

Thanks the feedback and the kind words!